diff --git a/CodePlay.Core/Services/ConversionService.cs b/CodePlay.Core/Services/ConversionService.cs
index 64ebc39..1eea0da 100644
--- a/CodePlay.Core/Services/ConversionService.cs
+++ b/CodePlay.Core/Services/ConversionService.cs
@@ -3,6 +3,7 @@ using CodePlay.Core.Models;
 using CodePlay.Core.Common;
 using CodePlay.Core.Parsers;
 using CodePlay.Core.Converters;
+using CodePlay.Core.Validators;
 
 namespace CodePlay.Core.Services;
 
@@ -12,12 +13,16 @@ namespace CodePlay.Core.Services;
 public class ConversionService
 {
     private readonly Dictionary<(LanguageType, LanguageType), IConverter> _converters = new();
+    private readonly ValidationPipeline _validationPipeline;
     
     public ConversionService()
     {
         // 注册转换器
         RegisterConverter(LanguageType.CSharp, LanguageType.Java, new CSharpToJavaConverter());
         RegisterConverter(LanguageType.Java, LanguageType.CSharp, new JavaToCSharpConverter());
+        
+        // 初始化验证流水线
+        _validationPipeline = new ValidationPipeline();
     }
     
     private void RegisterConverter(LanguageType source, LanguageType target, IConverter converter)
@@ -59,6 +64,24 @@ public class ConversionService
             // 执行转换
             var result = await converter.ConvertAsync(syntaxTree, request.TargetLanguage, request.Options, cancellationToken);
             
+            // 执行验证（仅当目标语言是 C# 时）
+            if (result.Success && request.TargetLanguage == LanguageType.CSharp && request.ValidationRounds > 0)
+            {
+                var validationSummary = await _validationPipeline.ValidateAsync(
+                    result.TransformedCode, 
+                    request.TargetLanguage, 
+                    request.ValidationRounds,
+                    cancellationToken);
+                
+                result.ValidationSummary = validationSummary;
+                
+                if (!validationSummary.Passed)
+                {
+                    result.Success = false;
+                    result.ErrorMessage = $"Validation failed after {validationSummary.RoundsExecuted} rounds";
+                }
+            }
+            
             return result;
         }
         catch (Exception ex)
diff --git a/CodePlay.Core/Validators/AutoFixEngine.cs b/CodePlay.Core/Validators/AutoFixEngine.cs
new file mode 100644
index 0000000..2462a78
--- /dev/null
+++ b/CodePlay.Core/Validators/AutoFixEngine.cs
@@ -0,0 +1,199 @@
+using System.Text;
+using CodePlay.Core.Interfaces;
+using CodePlay.Core.Models;
+using CodePlay.Core.Common;
+
+namespace CodePlay.Core.Validators;
+
+/// <summary>
+/// 自动修复引擎
+/// </summary>
+public class AutoFixEngine
+{
+    /// <summary>
+    /// 尝试修复编译错误
+    /// </summary>
+    public Task<FixResult> FixAsync(string code, List<CompilationError> errors, int round, CancellationToken cancellationToken = default)
+    {
+        var result = new FixResult
+        {
+            CanFix = false,
+            RemainingErrors = new List<CompilationError>()
+        };
+        
+        if (errors == null || errors.Count == 0)
+        {
+            result.CanFix = true;
+            result.FixedCode = code;
+            result.FixDescription = "No errors to fix";
+            return Task.FromResult(result);
+        }
+        
+        switch (round)
+        {
+            case 1:
+                result = FixRound1(code, errors);
+                break;
+            case 2:
+                result = FixRound2(code, errors);
+                break;
+            case 3:
+                result = FixRound3(code, errors);
+                break;
+            default:
+                result.RemainingErrors = errors;
+                break;
+        }
+        
+        return Task.FromResult(result);
+    }
+    
+    /// <summary>
+    /// 第 1 轮：修复导入/using 语句
+    /// </summary>
+    private FixResult FixRound1(string code, List<CompilationError> errors)
+    {
+        var result = new FixResult
+        {
+            CanFix = false,
+            RemainingErrors = new List<CompilationError>(),
+            FixDescription = string.Empty
+        };
+        
+        var needsSystemUsing = false;
+        var needsCollectionsUsing = false;
+        var needsLinqUsing = false;
+        
+        foreach (var error in errors)
+        {
+            if (error.ErrorId == "CS0246" || error.ErrorId == "CS0103")
+            {
+                if (error.Message.Contains("Console"))
+                {
+                    needsSystemUsing = true;
+                }
+                else if (error.Message.Contains("List") || error.Message.Contains("Dictionary"))
+                {
+                    needsCollectionsUsing = true;
+                }
+                else if (error.Message.Contains("LINQ") || error.Message.Contains("var"))
+                {
+                    needsLinqUsing = true;
+                }
+                else
+                {
+                    result.RemainingErrors.Add(error);
+                }
+            }
+            else
+            {
+                result.RemainingErrors.Add(error);
+            }
+        }
+        
+        var fixedCode = code;
+        var fixDescription = new StringBuilder();
+        
+        if (needsSystemUsing && !code.Contains("using System;"))
+        {
+            fixedCode = fixedCode.Insert(0, "using System;\n");
+            fixDescription.Append("Added using System; ");
+        }
+        
+        if (needsCollectionsUsing && !code.Contains("using System.Collections.Generic;"))
+        {
+            fixedCode = fixedCode.Insert(0, "using System.Collections.Generic;\n");
+            fixDescription.Append("Added using System.Collections.Generic;");
+        }
+        
+        if (needsLinqUsing && !code.Contains("using System.Linq;"))
+        {
+            fixedCode = fixedCode.Insert(0, "using System.Linq;\n");
+            fixDescription.Append("Added using System.Linq;");
+        }
+        
+        if (fixDescription.Length > 0)
+        {
+            result.CanFix = true;
+            result.FixedCode = fixedCode;
+            result.FixDescription = fixDescription.ToString().Trim();
+        }
+        
+        return result;
+    }
+    
+    /// <summary>
+    /// 第 2 轮：修复类型映射
+    /// </summary>
+    private FixResult FixRound2(string code, List<CompilationError> errors)
+    {
+        var result = new FixResult
+        {
+            CanFix = false,
+            RemainingErrors = new List<CompilationError>(),
+            FixDescription = string.Empty
+        };
+        
+        var fixedCode = code;
+        var hasFixes = false;
+        var fixDescription = new StringBuilder();
+        
+        foreach (var error in errors)
+        {
+            if (error.ErrorId == "CS0246")
+            {
+                if (error.Message.Contains("String"))
+                {
+                    fixedCode = fixedCode.Replace("String", "string");
+                    hasFixes = true;
+                    fixDescription.Append("Mapped String to string; ");
+                }
+                else if (error.Message.Contains("ArrayList"))
+                {
+                    fixedCode = fixedCode.Replace("ArrayList", "List<object>");
+                    hasFixes = true;
+                    fixDescription.Append("Mapped ArrayList to List<object>; ");
+                }
+                else if (error.Message.Contains("HashMap"))
+                {
+                    fixedCode = fixedCode.Replace("HashMap", "Dictionary<object, object>");
+                    hasFixes = true;
+                    fixDescription.Append("Mapped HashMap to Dictionary;");
+                }
+                else
+                {
+                    result.RemainingErrors.Add(error);
+                }
+            }
+            else
+            {
+                result.RemainingErrors.Add(error);
+            }
+        }
+        
+        if (hasFixes)
+        {
+            result.CanFix = true;
+            result.FixedCode = fixedCode;
+            result.FixDescription = fixDescription.ToString().Trim();
+        }
+        
+        return result;
+    }
+    
+    /// <summary>
+    /// 第 3 轮：修复 API 调用
+    /// </summary>
+    private FixResult FixRound3(string code, List<CompilationError> errors)
+    {
+        var result = new FixResult
+        {
+            CanFix = false,
+            RemainingErrors = errors,
+            FixDescription = "Round 3 fixes not implemented in MVP"
+        };
+        
+        // MVP 版本暂不实现复杂修复
+        return result;
+    }
+}
diff --git a/CodePlay.Core/Validators/CSharpCompilerValidator.cs b/CodePlay.Core/Validators/CSharpCompilerValidator.cs
new file mode 100644
index 0000000..f2a1067
--- /dev/null
+++ b/CodePlay.Core/Validators/CSharpCompilerValidator.cs
@@ -0,0 +1,99 @@
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.Emit;
+using CodePlay.Core.Interfaces;
+using CodePlay.Core.Models;
+using CodePlay.Core.Common;
+
+namespace CodePlay.Core.Validators;
+
+/// <summary>
+/// C# 编译验证器
+/// </summary>
+public class CSharpCompilerValidator
+{
+    /// <summary>
+    /// 编译并验证 C# 代码
+    /// </summary>
+    public async Task<CompilationResult> ValidateAsync(string code, CancellationToken cancellationToken = default)
+    {
+        var result = new CompilationResult
+        {
+            Success = false,
+            Output = string.Empty,
+            Errors = new List<CompilationError>(),
+            Warnings = new List<CompilationError>()
+        };
+        
+        try
+        {
+            // 创建语法树
+            var syntaxTree = CSharpSyntaxTree.ParseText(code, cancellationToken: cancellationToken);
+            
+            // 创建编译
+            var compilation = CSharpCompilation.Create(
+                "CodePlayValidation",
+                new[] { syntaxTree },
+                new[]
+                {
+                    MetadataReference.CreateFromFile(typeof(object).Assembly.Location),
+                    MetadataReference.CreateFromFile(typeof(System.Linq.Enumerable).Assembly.Location),
+                    MetadataReference.CreateFromFile(typeof(System.Collections.Generic.List<>).Assembly.Location),
+                },
+                new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary));
+            
+            // Emit 到内存流
+            using var stream = new MemoryStream();
+            var emitResult = compilation.Emit(stream, cancellationToken: cancellationToken);
+            
+            if (emitResult.Success)
+            {
+                result.Success = true;
+                result.Output = "Compilation succeeded";
+            }
+            else
+            {
+                result.Success = false;
+                
+                // 收集诊断信息
+                foreach (var diagnostic in emitResult.Diagnostics)
+                {
+                    var error = new CompilationError
+                    {
+                        ErrorId = diagnostic.Id,
+                        Message = diagnostic.GetMessage(),
+                        LineNumber = diagnostic.Location.GetLineSpan().StartLinePosition.Line + 1,
+                        ColumnNumber = diagnostic.Location.GetLineSpan().StartLinePosition.Character + 1,
+                        IsError = diagnostic.Severity == DiagnosticSeverity.Error
+                    };
+                    
+                    if (diagnostic.Severity == DiagnosticSeverity.Error)
+                    {
+                        result.Errors.Add(error);
+                    }
+                    else if (diagnostic.Severity == DiagnosticSeverity.Warning)
+                    {
+                        result.Warnings.Add(error);
+                    }
+                }
+                
+                result.Output = $"Compilation failed with {result.Errors.Count} errors and {result.Warnings.Count} warnings";
+            }
+        }
+        catch (Exception ex)
+        {
+            result.Success = false;
+            result.Output = $"Compilation error: {ex.Message}";
+            result.Errors.Add(new CompilationError
+            {
+                ErrorId = "EXCEPTION",
+                Message = ex.Message,
+                LineNumber = 0,
+                ColumnNumber = 0,
+                IsError = true
+            });
+        }
+        
+        return await Task.FromResult(result);
+    }
+}
diff --git a/CodePlay.Core/Validators/ValidationPipeline.cs b/CodePlay.Core/Validators/ValidationPipeline.cs
new file mode 100644
index 0000000..9e85df1
--- /dev/null
+++ b/CodePlay.Core/Validators/ValidationPipeline.cs
@@ -0,0 +1,82 @@
+using CodePlay.Core.Interfaces;
+using CodePlay.Core.Models;
+using CodePlay.Core.Common;
+
+namespace CodePlay.Core.Validators;
+
+/// <summary>
+/// 验证流水线服务
+/// </summary>
+public class ValidationPipeline
+{
+    private readonly CSharpCompilerValidator _validator;
+    private readonly AutoFixEngine _fixEngine;
+    
+    public ValidationPipeline()
+    {
+        _validator = new CSharpCompilerValidator();
+        _fixEngine = new AutoFixEngine();
+    }
+    
+    /// <summary>
+    /// 执行验证流水线
+    /// </summary>
+    public async Task<ValidationSummary> ValidateAsync(
+        string code, 
+        LanguageType language, 
+        int maxRounds = 3,
+        CancellationToken cancellationToken = default)
+    {
+        var summary = new ValidationSummary
+        {
+            Passed = false,
+            RoundsExecuted = 0,
+            NeedsManualReview = false,
+            CompilationErrors = new List<CompilationError>(),
+            ValidationLog = new List<string>()
+        };
+        
+        summary.ValidationLog.Add($"Starting validation at {DateTime.UtcNow:HH:mm:ss.fff}");
+        
+        for (int round = 1; round <= maxRounds; round++)
+        {
+            summary.RoundsExecuted = round;
+            summary.ValidationLog.Add($"Round {round} starting");
+            
+            // 编译验证
+            var compileResult = await _validator.ValidateAsync(code, cancellationToken);
+            
+            if (compileResult.Success)
+            {
+                summary.Passed = true;
+                summary.ValidationLog.Add($"Round {round}: Compilation succeeded");
+                break;
+            }
+            
+            summary.CompilationErrors = compileResult.Errors;
+            summary.ValidationLog.Add($"Round {round}: Compilation failed with {compileResult.Errors.Count} errors");
+            
+            // 尝试自动修复
+            var fixResult = await _fixEngine.FixAsync(code, compileResult.Errors, round, cancellationToken);
+            
+            if (fixResult.CanFix)
+            {
+                code = fixResult.FixedCode!;
+                summary.ValidationLog.Add($"Round {round}: Auto-fix applied - {fixResult.FixDescription}");
+            }
+            else
+            {
+                summary.NeedsManualReview = true;
+                summary.ValidationLog.Add($"Round {round}: Cannot auto-fix, needs manual review");
+                break;
+            }
+        }
+        
+        if (!summary.Passed)
+        {
+            summary.ValidationLog.Add($"Validation completed - Needs manual review");
+        }
+        
+        return summary;
+    }
+}
diff --git a/CodePlay.Tests/Validators/ValidatorTests.cs b/CodePlay.Tests/Validators/ValidatorTests.cs
new file mode 100644
index 0000000..acc24f1
--- /dev/null
+++ b/CodePlay.Tests/Validators/ValidatorTests.cs
@@ -0,0 +1,214 @@
+using CodePlay.Core.Validators;
+using CodePlay.Core.Models;
+using CodePlay.Core.Common;
+using Xunit;
+
+namespace CodePlay.Tests.Validators;
+
+public class CSharpCompilerValidatorTests
+{
+    private readonly CSharpCompilerValidator _validator;
+    
+    public CSharpCompilerValidatorTests()
+    {
+        _validator = new CSharpCompilerValidator();
+    }
+    
+    [Fact]
+    public async Task ValidateAsync_ValidCode_ShouldSucceed()
+    {
+        var code = @"
+public class Test
+{
+    public int Add(int a, int b)
+    {
+        return a + b;
+    }
+}";
+        
+        var result = await _validator.ValidateAsync(code);
+        
+        Assert.True(result.Success);
+        Assert.Empty(result.Errors);
+    }
+    
+    [Fact]
+    public async Task ValidateAsync_InvalidCode_ShouldFail()
+    {
+        var code = @"
+public class Test
+{
+    public static void Main()
+    {
+        // Missing closing brace
+    ";
+        
+        var result = await _validator.ValidateAsync(code);
+        
+        Assert.False(result.Success);
+        Assert.NotEmpty(result.Errors);
+    }
+    
+    [Fact]
+    public async Task ValidateAsync_MissingUsing_ShouldFailWithReferences()
+    {
+        var code = @"
+public class Test
+{
+    public static void Main()
+    {
+        Console.WriteLine(""Hello"");
+    }
+}";
+        
+        var result = await _validator.ValidateAsync(code);
+        
+        Assert.False(result.Success);
+        Assert.NotEmpty(result.Errors);
+        Assert.Contains(result.Errors, e => e.ErrorId == "CS0103");
+    }
+}
+
+public class AutoFixEngineTests
+{
+    private readonly AutoFixEngine _fixEngine;
+    
+    public AutoFixEngineTests()
+    {
+        _fixEngine = new AutoFixEngine();
+    }
+    
+    [Fact]
+    public async Task FixAsync_Round1_AddsMissingUsing()
+    {
+        var code = @"
+public class Test
+{
+    public void Method()
+    {
+        Console.WriteLine(""test"");
+    }
+}";
+        
+        var errors = new List<CompilationError>
+        {
+            new CompilationError
+            {
+                ErrorId = "CS0103",
+                Message = "The name 'Console' does not exist in the current context",
+                LineNumber = 5,
+                ColumnNumber = 9,
+                IsError = true
+            }
+        };
+        
+        var result = await _fixEngine.FixAsync(code, errors, 1);
+        
+        Assert.True(result.CanFix);
+        Assert.Contains("using System;", result.FixedCode);
+    }
+    
+    [Fact]
+    public async Task FixAsync_NoErrors_ShouldReturnSuccess()
+    {
+        var code = "public class Test { }";
+        var errors = new List<CompilationError>();
+        
+        var result = await _fixEngine.FixAsync(code, errors, 1);
+        
+        Assert.True(result.CanFix);
+        Assert.Equal(code, result.FixedCode);
+    }
+    
+    [Fact]
+    public async Task FixAsync_Round2_FixesTypeMapping()
+    {
+        var code = @"
+public class Test
+{
+    public String Name = ""test"";
+}";
+        
+        var errors = new List<CompilationError>
+        {
+            new CompilationError
+            {
+                ErrorId = "CS0246",
+                Message = "The type or namespace name 'String' could not be found",
+                LineNumber = 3,
+                ColumnNumber = 12,
+                IsError = true
+            }
+        };
+        
+        var result = await _fixEngine.FixAsync(code, errors, 2);
+        
+        Assert.True(result.CanFix);
+        Assert.Contains("string", result.FixedCode);
+    }
+}
+
+public class ValidationPipelineTests
+{
+    private readonly ValidationPipeline _pipeline;
+    
+    public ValidationPipelineTests()
+    {
+        _pipeline = new ValidationPipeline();
+    }
+    
+    [Fact]
+    public async Task ValidateAsync_ValidCode_ShouldPass()
+    {
+        var code = @"
+public class Test
+{
+    public void Method()
+    {
+        var x = 1 + 2;
+    }
+}";
+        
+        var result = await _pipeline.ValidateAsync(code, LanguageType.CSharp, 3);
+        
+        Assert.True(result.Passed);
+        Assert.Equal(1, result.RoundsExecuted);
+        Assert.False(result.NeedsManualReview);
+    }
+    
+    [Fact]
+    public async Task ValidateAsync_CanAutoFix_ShouldPassAfterFix()
+    {
+        var code = @"
+public class Test
+{
+    public static void Main()
+    {
+        Console.WriteLine(""Hello"");
+    }
+}";
+        
+        var result = await _pipeline.ValidateAsync(code, LanguageType.CSharp, 3);
+        
+        // 应该能够自动修复 using 语句
+        Assert.True(result.Passed || result.NeedsManualReview);
+        Assert.True(result.RoundsExecuted >= 1);
+    }
+    
+    [Fact]
+    public async Task ValidateAsync_InvalidCode_ShouldFail()
+    {
+        var code = @"
+public class Test
+{
+    public static void Main()
+    {
+        // Syntax error
+    ";
+        
+        var result = await _pipeline.ValidateAsync(code, LanguageType.CSharp, 3);
+        
+        Assert.False(result.Passed);
+        Assert.True(result.NeedsManualReview);
+    }
+}