diff --git a/CodePlay.Core/Models/ConversionModels.cs b/CodePlay.Core/Models/ConversionModels.cs
index 80d5e09..52f0470 100644
--- a/CodePlay.Core/Models/ConversionModels.cs
+++ b/CodePlay.Core/Models/ConversionModels.cs
@@ -115,6 +115,26 @@ public class ConversionResult
 /// </summary>
 public class ConversionReport
 {
+    /// <summary>
+    /// 报告 ID
+    /// </summary>
+    public string Id { get; set; } = Guid.NewGuid().ToString("N")[..20];
+    
+    /// <summary>
+    /// 项目 ID
+    /// </summary>
+    public string ProjectId { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// 源语言
+    /// </summary>
+    public LanguageType SourceLanguage { get; set; }
+    
+    /// <summary>
+    /// 目标语言
+    /// </summary>
+    public LanguageType TargetLanguage { get; set; }
+    
     /// <summary>
     /// 转换的行数
     /// </summary>
@@ -135,6 +155,16 @@ public class ConversionReport
     /// </summary>
     public TimeSpan Duration { get; set; }
     
+    /// <summary>
+    /// 问题数量
+    /// </summary>
+    public int IssueCount { get; set; }
+    
+    /// <summary>
+    /// TODO 数量
+    /// </summary>
+    public int TodoCount { get; set; }
+    
     /// <summary>
     /// 问题列表
     /// </summary>
@@ -149,6 +179,21 @@ public class ConversionReport
     /// TODO 列表
     /// </summary>
     public List<TodoItem> TodoItems { get; set; } = new();
+    
+    /// <summary>
+    /// 验证状态
+    /// </summary>
+    public string ValidationStatus { get; set; } = "NotValidated";
+    
+    /// <summary>
+    /// 最后验证时间
+    /// </summary>
+    public DateTime? LastValidatedAt { get; set; }
+    
+    /// <summary>
+    /// 创建时间
+    /// </summary>
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
 }
 
 /// <summary>
diff --git a/CodePlay.Core/Services/ReportStorageService.cs b/CodePlay.Core/Services/ReportStorageService.cs
new file mode 100644
index 0000000..f81353b
--- /dev/null
+++ b/CodePlay.Core/Services/ReportStorageService.cs
@@ -0,0 +1,119 @@
+using System.Collections.Concurrent;
+using System.Text.Json;
+using CodePlay.Core.Models;
+using CodePlay.Core.Common;
+
+namespace CodePlay.Core.Services;
+
+/// <summary>
+/// 转换报告存储服务（内存版 MVP）
+/// </summary>
+public interface IReportStorageService
+{
+    Task<ConversionReport> SaveReportAsync(ConversionReport report, string? projectId = null);
+    Task<ConversionReport?> GetReportAsync(string reportId);
+    Task<List<ConversionReport>> GetReportsByProjectAsync(string projectId);
+    Task<List<ConversionReport>> GetAllReportsAsync();
+    Task DeleteReportAsync(string reportId);
+    Task<ConversionStatistics> GetStatisticsAsync();
+}
+
+public class ReportStorageService : IReportStorageService
+{
+    private readonly ConcurrentDictionary<string, ConversionReport> _reports = new();
+    private readonly ConcurrentDictionary<string, ProjectInfo> _projects = new();
+    
+    public Task<ConversionReport> SaveReportAsync(ConversionReport report, string? projectId = null)
+    {
+        report.Id = Guid.NewGuid().ToString("N")[..20];
+        report.ProjectId = projectId ?? "default";
+        report.CreatedAt = DateTime.UtcNow;
+        
+        _reports[report.Id] = report;
+        
+        // 更新项目统计
+        if (projectId != null && _projects.ContainsKey(projectId))
+        {
+            _projects[projectId].TotalConversions++;
+            _projects[projectId].UpdatedAt = DateTime.UtcNow;
+        }
+        
+        return Task.FromResult(report);
+    }
+    
+    public Task<ConversionReport?> GetReportAsync(string reportId)
+    {
+        _reports.TryGetValue(reportId, out var report);
+        return Task.FromResult(report);
+    }
+    
+    public Task<List<ConversionReport>> GetReportsByProjectAsync(string projectId)
+    {
+        var reports = _reports.Values
+            .Where(r => r.ProjectId == projectId)
+            .OrderByDescending(r => r.CreatedAt)
+            .ToList();
+        
+        return Task.FromResult(reports);
+    }
+    
+    public Task<List<ConversionReport>> GetAllReportsAsync()
+    {
+        var reports = _reports.Values
+            .OrderByDescending(r => r.CreatedAt)
+            .ToList();
+        
+        return Task.FromResult(reports);
+    }
+    
+    public Task DeleteReportAsync(string reportId)
+    {
+        _reports.TryRemove(reportId, out _);
+        return Task.CompletedTask;
+    }
+    
+    public Task<ConversionStatistics> GetStatisticsAsync()
+    {
+        var reports = _reports.Values.ToList();
+        
+        var statistics = new ConversionStatistics
+        {
+            TotalConversions = reports.Count,
+            TotalProjects = _projects.Count,
+            ConversionsByLanguage = reports.GroupBy(r => r.TargetLanguage)
+                .ToDictionary(g => g.Key, g => g.Count()),
+            AverageLinesConverted = reports.Any() ? reports.Average(r => r.LinesConverted) : 0,
+            TotalIssuesDetected = reports.Sum(r => r.IssueCount),
+            TotalTODOs = reports.Sum(r => r.TodoCount)
+        };
+        
+        return Task.FromResult(statistics);
+    }
+}
+
+/// <summary>
+/// 转换统计信息
+/// </summary>
+public class ConversionStatistics
+{
+    public int TotalConversions { get; set; }
+    public int TotalProjects { get; set; }
+    public Dictionary<LanguageType, int> ConversionsByLanguage { get; set; } = new();
+    public double AverageLinesConverted { get; set; }
+    public int TotalIssuesDetected { get; set; }
+    public int TotalTODOs { get; set; }
+}
+
+/// <summary>
+/// 项目信息
+/// </summary>
+public class ProjectInfo
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString("N")[..20];
+    public string Name { get; set; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
+    public List<string> Languages { get; set; } = new();
+    public int TotalConversions { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime? UpdatedAt { get; set; }
+}
diff --git a/CodePlay.WebAPI/Controllers/ReportController.cs b/CodePlay.WebAPI/Controllers/ReportController.cs
new file mode 100644
index 0000000..894ce4b
--- /dev/null
+++ b/CodePlay.WebAPI/Controllers/ReportController.cs
@@ -0,0 +1,55 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using CodePlay.Core.Services;
+using CodePlay.Core.Models;
+
+namespace CodePlay.WebAPI.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+[Authorize]
+public class ReportController : ControllerBase
+{
+    private readonly IReportStorageService _storageService;
+    
+    public ReportController(IReportStorageService storageService)
+    {
+        _storageService = storageService;
+    }
+    
+    [HttpGet]
+    public async Task<ActionResult<List<ConversionReport>>> GetAllReports()
+    {
+        var reports = await _storageService.GetAllReportsAsync();
+        return Ok(reports);
+    }
+    
+    [HttpGet("{reportId}")]
+    public async Task<ActionResult<ConversionReport>> GetReport(string reportId)
+    {
+        var report = await _storageService.GetReportAsync(reportId);
+        if (report == null) return NotFound();
+        return Ok(report);
+    }
+    
+    [HttpGet("project/{projectId}")]
+    public async Task<ActionResult<List<ConversionReport>>> GetReportsByProject(string projectId)
+    {
+        var reports = await _storageService.GetReportsByProjectAsync(projectId);
+        return Ok(reports);
+    }
+    
+    [HttpDelete("{reportId}")]
+    public async Task<IActionResult> DeleteReport(string reportId)
+    {
+        await _storageService.DeleteReportAsync(reportId);
+        return NoContent();
+    }
+    
+    [HttpGet("stats")]
+    public async Task<ActionResult<Core.Services.ConversionStatistics>> GetStatistics()
+    {
+        var stats = await _storageService.GetStatisticsAsync();
+        return Ok(stats);
+    }
+}