diff --git "a/data/2.PostgreSQL\344\270\255\351\230\266/1.PostgreSQL\346\225\260\346\215\256\345\272\223\347\232\204\345\237\272\346\234\254\347\273\223\346\236\204/6.\346\225\260\346\215\256\345\272\223\346\211\251\345\261\225/config.json" "b/data/2.PostgreSQL\344\270\255\351\230\266/1.PostgreSQL\346\225\260\346\215\256\345\272\223\347\232\204\345\237\272\346\234\254\347\273\223\346\236\204/6.\346\225\260\346\215\256\345\272\223\346\211\251\345\261\225/config.json"
index fb9d9e325f740a96fd609edacecde0adc781d4fb..05176beac9db4af28f710f8d822430b509df3dac 100644
--- "a/data/2.PostgreSQL\344\270\255\351\230\266/1.PostgreSQL\346\225\260\346\215\256\345\272\223\347\232\204\345\237\272\346\234\254\347\273\223\346\236\204/6.\346\225\260\346\215\256\345\272\223\346\211\251\345\261\225/config.json"
+++ "b/data/2.PostgreSQL\344\270\255\351\230\266/1.PostgreSQL\346\225\260\346\215\256\345\272\223\347\232\204\345\237\272\346\234\254\347\273\223\346\236\204/6.\346\225\260\346\215\256\345\272\223\346\211\251\345\261\225/config.json"
@@ -1,6 +1,13 @@
 {
   "node_id": "pg-d2b6e840cfad44a2aa357cfee56d437d",
-  "keywords": ["数据库扩展", "数据库插件", "extension"],
+  "keywords": [
+    "数据库扩展",
+    "数据库插件",
+    "extension"
+  ],
   "children": [],
-  "export": []
+  "export": [
+    "language.json",
+    "extension.json"
+  ]
 }
\ No newline at end of file
diff --git "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/1.\350\201\232\345\220\210\345\222\214\345\210\206\347\273\204/config.json" "b/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/1.\350\201\232\345\220\210\345\222\214\345\210\206\347\273\204/config.json"
index 7d7c5861d26c74d5aa385ac6fc74b3e860ebea83..d23aa9c436d02697282f817e66decfff21183805 100644
--- "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/1.\350\201\232\345\220\210\345\222\214\345\210\206\347\273\204/config.json"
+++ "b/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/1.\350\201\232\345\220\210\345\222\214\345\210\206\347\273\204/config.json"
@@ -1,6 +1,11 @@
 {
   "node_id": "pg-3a87b0dbead643e58f1ff1d93acd80cc",
-  "keywords": ["group by", "分组"],
+  "keywords": [
+    "group by",
+    "分组"
+  ],
   "children": [],
-  "export": []
+  "export": [
+    "salary.json"
+  ]
 }
\ No newline at end of file
diff --git "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/2.\350\277\236\346\216\245\346\237\245\350\257\242/config.json" "b/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/2.\350\277\236\346\216\245\346\237\245\350\257\242/config.json"
index 26d2258e02364b4fec81e91f82f5459755a52964..5a941b68e7a35bc572f8387babc2e5c6e65278a5 100644
--- "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/2.\350\277\236\346\216\245\346\237\245\350\257\242/config.json"
+++ "b/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/2.\350\277\236\346\216\245\346\237\245\350\257\242/config.json"
@@ -1,6 +1,11 @@
 {
   "node_id": "pg-458d5d590ea64188847b45d8e6343f83",
-  "keywords": ["join", "连接查询"],
+  "keywords": [
+    "join",
+    "连接查询"
+  ],
   "children": [],
-  "export": []
+  "export": [
+    "customer_order.json"
+  ]
 }
\ No newline at end of file
diff --git "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/5.CTE/config.json" "b/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/5.CTE/config.json"
index 146c831e3d56a84a9dcf0d2765175fedc5f5f888..c916f507b8a52264864fc36add1e9738dc20c7d2 100644
--- "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/5.CTE/config.json"
+++ "b/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/5.CTE/config.json"
@@ -1,6 +1,12 @@
 {
   "node_id": "pg-6beb084543204f4f9d87930c0a6c5707",
-  "keywords": ["common table expression", "cte", "recursive"],
+  "keywords": [
+    "common table expression",
+    "cte",
+    "recursive"
+  ],
   "children": [],
-  "export": []
+  "export": [
+    "to_root.json"
+  ]
 }
\ No newline at end of file
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/1.\351\233\206\347\276\244\345\222\214\345\244\215\345\210\266/3.fdw/config.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/1.\351\233\206\347\276\244\345\222\214\345\244\215\345\210\266/3.fdw/config.json"
index 688ad40557c4e3884ef42ba6580d36330a9eb7fb..f668756391166dc2ee48363ffa12cec6d276ea8a 100644
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/1.\351\233\206\347\276\244\345\222\214\345\244\215\345\210\266/3.fdw/config.json"
+++ "b/data/3.PostgreSQL\351\253\230\351\230\266/1.\351\233\206\347\276\244\345\222\214\345\244\215\345\210\266/3.fdw/config.json"
@@ -1,6 +1,11 @@
 {
   "node_id": "pg-20a433f6ae65429f9b1a7f17c751ac01",
-  "keywords": ["外部数据连接", "fdw"],
+  "keywords": [
+    "外部数据连接",
+    "fdw"
+  ],
   "children": [],
-  "export": []
+  "export": [
+    "fdw.json"
+  ]
 }
\ No newline at end of file
diff --git a/src/tree.py b/src/tree.py
index ae5c7e5861641fa56461104badcfefcaecc8412a..b5a8cb26891d2283019c0347bc3bb1b5bdfef96f 100644
--- a/src/tree.py
+++ b/src/tree.py
@@ -306,13 +306,23 @@ class TreeWalker:
 
     def ensure_exercises(self, section_path):
         config = self.ensure_section_config(section_path)
+        flag = False
         for e in os.listdir(section_path):
             base, ext = os.path.splitext(e)
             _, source = os.path.split(e)
             if ext != ".md":
                 continue
-            meta_path = os.path.join(section_path, base + ".json")
+            mfile = base + ".json"
+            meta_path = os.path.join(section_path, mfile)
             self.ensure_exercises_meta(meta_path, source)
+            export = config.get("export", [])
+            if mfile not in export:
+                export.append(mfile)
+                flag = True
+                config["export"] = export
+
+        if flag:
+            dump_json(os.path.join(section_path, "config.json"), config, True, True)
 
         for e in config.get("export", []):
             full_name = os.path.join(section_path, e)