diff --git a/app/services/qgis/qgis_runner.py b/app/services/qgis/qgis_runner.py
index 0b4d243..b45abb9 100644
--- a/app/services/qgis/qgis_runner.py
+++ b/app/services/qgis/qgis_runner.py
@@ -44,7 +44,11 @@ def _setup_python_path():
 
 def _setup_environment():
     """设置 QGIS 运行所需的环境变量"""
+    # 自动检测 QGIS 应用目录
     qgis_app_dir = os.path.join(QGIS_ROOT, "apps", "qgis-ltr")
+    if not os.path.isdir(qgis_app_dir):
+        qgis_app_dir = os.path.join(QGIS_ROOT, "apps", "qgis")
+
     os.environ["QGIS_PREFIX_PATH"] = qgis_app_dir
     os.environ["PYTHONUTF8"] = "1"
     os.environ["GDAL_FILENAME_IS_UTF8"] = "YES"
@@ -60,6 +64,15 @@ def _setup_environment():
         if os.path.isdir(gdal_data):
             os.environ["GDAL_DATA"] = gdal_data
 
+        # 强制使用 QGIS 自带的 PROJ，避免 PostgreSQL/PostGIS 的旧 proj.db 干扰
+        for proj_dir in [
+            os.path.join(qgis_app_dir, "share", "proj"),
+            os.path.join(QGIS_ROOT, "share", "proj"),
+        ]:
+            if os.path.isdir(proj_dir):
+                os.environ["PROJ_DATA"] = proj_dir
+                break
+
         import ctypes
         _dll_dirs = [
             os.path.join(qgis_app_dir, "bin"),