diff --git a/05-ISSUES/known-patterns.json b/05-ISSUES/known-patterns.json
index 19dfa8b..f1f4c39 100644
--- a/05-ISSUES/known-patterns.json
+++ b/05-ISSUES/known-patterns.json
@@ -48,6 +48,23 @@
         "不要在baseURL和API路径中同时包含/api"
       ]
     },
+    "pat-003-A": {
+      "name": "修改baseURL后API路径未同步更新",
+      "source": "implementation_review",
+      "confidence": 1.0,
+      "applications": 1,
+      "created": "2026-03-23",
+      "category": "frontend",
+      "pattern": "修改baseURL后，所有API文件的路径未同步更新，导致路径不一致",
+      "problem": "fa344f9c修改baseURL从http://localhost:8080/api到http://localhost:8080，但auth.ts等文件的/api/auth/login未改为/auth/login，或反之",
+      "root_cause": "修改baseURL时没有同步检查和更新所有API文件的路径",
+      "solution": "修改baseURL后必须同步更新所有API文件的路径，保持一致性",
+      "quality_rules": [
+        "baseURL和API路径必须配套：baseURL=http://localhost:8080时，API路径=/api/xxx",
+        "修改baseURL时用 grep -r '/api/' src/api/ 检查所有文件",
+        "建议在ESLint或构建脚本中增加路径一致性检查"
+      ]
+    },
     "pat-004": {
       "name": "CORS配置端口限制",
       "source": "implementation_review",