diff --git a/src/genesis/server/store.py b/src/genesis/server/store.py
index dc56870..18a3ab9 100644
--- a/src/genesis/server/store.py
+++ b/src/genesis/server/store.py
@@ -150,13 +150,31 @@ class SessionStore:
             raise SessionNotFoundError(f"会话不存在: {session_id}")
         return self._from_dict(json.loads(row["data"]))
 
-    def list_sessions(self, user_id: str) -> list[SessionRecord]:
-        with self._conn() as c:
-            rows = c.execute(
-                "SELECT data FROM sessions WHERE user_id = ?",
-                (user_id,),
-            ).fetchall()
-        recs = [self._from_dict(json.loads(r["data"])) for r in rows]
+    def list_sessions(self, user_id: str, project: str | None = None) -> list[SessionRecord]:
+        if project is None:
+            with self._conn() as c:
+                rows = c.execute(
+                    "SELECT data FROM sessions WHERE user_id = ?",
+                    (user_id,),
+                ).fetchall()
+            recs = [self._from_dict(json.loads(r["data"])) for r in rows]
+        else:
+            try:
+                with self._conn() as c:
+                    rows = c.execute(
+                        "SELECT data FROM sessions WHERE user_id = ?"
+                        " AND json_extract(data, '$.project') = ?",
+                        (user_id, project),
+                    ).fetchall()
+                recs = [self._from_dict(json.loads(r["data"])) for r in rows]
+            except Exception:
+                # json_extract 不可用（旧 SQLite）→ 全量取回后 Python 过滤兜底
+                with self._conn() as c:
+                    rows = c.execute(
+                        "SELECT data FROM sessions WHERE user_id = ?", (user_id,)
+                    ).fetchall()
+                recs = [self._from_dict(json.loads(r["data"])) for r in rows]
+                recs = [r for r in recs if r.project == project]
         # updated_at 在 JSON data 内，无法用 SQL 列排序 → 取回后按时间降序
         recs.sort(key=lambda r: r.updated_at, reverse=True)
         return recs
diff --git a/tests/test_server_store.py b/tests/test_server_store.py
index aef09c2..e5452c3 100644
--- a/tests/test_server_store.py
+++ b/tests/test_server_store.py
@@ -213,3 +213,24 @@ def test_projects_upsert_empty_name_rejected(projects_store, tmp_path):
     with pytest.raises(ProjectConfigError):
         projects_store.upsert(name="", display_name="P", template="", write_instruction="",
                               rules=[], existing_system_code_dir="", design_docs_dir="")
+
+def test_list_sessions_filter_by_project(store):
+    a = store.create_session("u1", name="A", project="stock")
+    b = store.create_session("u1", name="B", project="other")
+    recs = store.list_sessions("u1", project="stock")
+    ids = {r.session_id for r in recs}
+    assert a.session_id in ids and b.session_id not in ids
+
+
+def test_list_sessions_filter_empty_project(store):
+    e = store.create_session("u1", name="E")
+    store.create_session("u1", name="X", project="stock")
+    recs = store.list_sessions("u1", project="")
+    assert all(r.project == "" for r in recs)
+    assert e.session_id in {r.session_id for r in recs}
+
+
+def test_list_sessions_no_project_returns_all(store):
+    store.create_session("u1", name="A", project="stock")
+    store.create_session("u1", name="B", project="other")
+    assert len(store.list_sessions("u1")) == 2