diff --git a/smtweb-framework/sw-framework-core/src/main/java/cc/smtweb/framework/core/common/SwConsts.java b/smtweb-framework/sw-framework-core/src/main/java/cc/smtweb/framework/core/common/SwConsts.java
index f18fa94..9e5c568 100644
--- a/smtweb-framework/sw-framework-core/src/main/java/cc/smtweb/framework/core/common/SwConsts.java
+++ b/smtweb-framework/sw-framework-core/src/main/java/cc/smtweb/framework/core/common/SwConsts.java
@@ -10,5 +10,6 @@ public interface SwConsts {
     String KEY_PARENT_ID = "pr";
     //级次码、字符串连接符
     String SPLIT_CHAR = "-";
-
+    //默认根节点
+    String DEF_ROOT_ID = "-1";
 }
diff --git a/smtweb-framework/sw-framework-core/src/main/java/cc/smtweb/framework/core/mvc/service/TreeHelper.java b/smtweb-framework/sw-framework-core/src/main/java/cc/smtweb/framework/core/mvc/service/TreeHelper.java
index 63a1b21..f67ea17 100644
--- a/smtweb-framework/sw-framework-core/src/main/java/cc/smtweb/framework/core/mvc/service/TreeHelper.java
+++ b/smtweb-framework/sw-framework-core/src/main/java/cc/smtweb/framework/core/mvc/service/TreeHelper.java
@@ -12,31 +12,46 @@ import cc.smtweb.framework.core.db.impl.DefaultEntity;
 import cc.smtweb.framework.core.db.vo.ModelField;
 import cc.smtweb.framework.core.db.vo.ModelTable;
 
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Comparator;
-import java.util.List;
+import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * Created by Akmm at 2022/3/17 19:56
  */
 public class TreeHelper<T extends DefaultEntity> {
+    private static Map<String, TreeHelper> mapInstance;
+    static {
+        mapInstance = new ConcurrentHashMap<>();
+    }
     private String tableName;
 
     private ModelTable table;
-    private AbstractCache<T> cache;
+    protected AbstractCache<T> cache;
     private EntityDao<T> dao;
 
     private String fieldParent;
     private String fieldLevelCode;
 
-    //todo 待扩展，进缓存
+
     public static TreeHelper getTreeHelper(String tableName) {
-        return new TreeHelper(tableName);
+        return mapInstance.computeIfAbsent(tableName, k-> new TreeHelper(tableName));
+    }
+
+    public static TreeHelper getTreeHelper(String tableName, Class<? extends TreeHelper> clazz) {
+        TreeHelper helper = mapInstance.get(tableName);
+        if (helper == null) {
+            try {
+                helper = clazz.newInstance();
+                mapInstance.put(tableName, helper);
+            } catch (Exception e) {
+                throw new SwException(e);
+            }
+        }
+        return helper;
     }
 
     //先禁止外部创建
-    private TreeHelper(String tableName) {
+    protected TreeHelper(String tableName) {
         this.tableName = tableName;
         table = ModelTableCache.getInstance().getByName(tableName);
         cache = CacheManager.getIntance().getCache(tableName);
diff --git a/smtweb-framework/sw-framework-core/src/main/resources/config/demo.json b/smtweb-framework/sw-framework-core/src/main/resources/config/demo.json
index 0631cf2..a03de12 100644
--- a/smtweb-framework/sw-framework-core/src/main/resources/config/demo.json
+++ b/smtweb-framework/sw-framework-core/src/main/resources/config/demo.json
@@ -103,8 +103,8 @@
     },
     {
       "name": "prj",
-      "title": "按目录",
-      "fields": "mc_prj_id",
+      "title": "按项目",
+      "fields": "mc_prj_id,mc_parent_id",
       "type": "L"
     }
   ]
diff --git a/smtweb-framework/sw-framework-core/target/classes/config/demo.json b/smtweb-framework/sw-framework-core/target/classes/config/demo.json
index 0631cf2..a03de12 100644
--- a/smtweb-framework/sw-framework-core/target/classes/config/demo.json
+++ b/smtweb-framework/sw-framework-core/target/classes/config/demo.json
@@ -103,8 +103,8 @@
     },
     {
       "name": "prj",
-      "title": "按目录",
-      "fields": "mc_prj_id",
+      "title": "按项目",
+      "fields": "mc_prj_id,mc_parent_id",
       "type": "L"
     }
   ]
diff --git a/smtweb-system/sw-system-bpm/src/main/java/cc/smtweb/system/bpm/web/design/table/ModelCatalogTreeHandler.java b/smtweb-system/sw-system-bpm/src/main/java/cc/smtweb/system/bpm/web/design/table/ModelCatalogTreeHandler.java
index ba6680f..372ec38 100644
--- a/smtweb-system/sw-system-bpm/src/main/java/cc/smtweb/system/bpm/web/design/table/ModelCatalogTreeHandler.java
+++ b/smtweb-system/sw-system-bpm/src/main/java/cc/smtweb/system/bpm/web/design/table/ModelCatalogTreeHandler.java
@@ -26,14 +26,14 @@ public class ModelCatalogTreeHandler extends AbstractTreeHandler<Object> {
     private long prj_id;//所属项目
     private int type;//查询类型：0-目录；1-表定义;2-页面定义
 
-    private TreeHelper<ModelCatalog> mcTreeHelper = null;
+    private ModelCatalogTreeHelper mcTreeHelper = null;
 
     @Override
     public void init(SwMap params, UserSession us) {
         super.init(params, us);
         type = params.readInt("type");
         prj_id = params.readLong("prj_id");
-        mcTreeHelper = (TreeHelper<ModelCatalog>) TreeHelper.getTreeHelper(ModelCatalog.ENTITY_NAME);
+        mcTreeHelper = (ModelCatalogTreeHelper) TreeHelper.getTreeHelper(ModelCatalog.ENTITY_NAME, ModelCatalogTreeHelper.class);
     }
 
     @Override
@@ -69,11 +69,7 @@ public class ModelCatalogTreeHandler extends AbstractTreeHandler<Object> {
     protected List<Object> getChildren(long id) {
         List<Object> listRet = new ArrayList<>();
         List<ModelCatalog> list;
-        if (id > 0) {
-            list = mcTreeHelper.getChildren(id, (o1, o2) -> CommUtil.chineseCompare(o1.getName(), o2.getName()));
-        } else {
-            list = mcTreeHelper.getChildren(-1, (o1, o2) -> CommUtil.chineseCompare(o1.getName(), o2.getName()));
-        }
+        list = mcTreeHelper.getChildren(id, prj_id, (o1, o2) -> CommUtil.chineseCompare(o1.getName(), o2.getName()));
 
         listRet.addAll(list);
 
diff --git a/smtweb-system/sw-system-bpm/src/main/java/cc/smtweb/system/bpm/web/design/table/ModelCatalogTreeHelper.java b/smtweb-system/sw-system-bpm/src/main/java/cc/smtweb/system/bpm/web/design/table/ModelCatalogTreeHelper.java
new file mode 100644
index 0000000..8cc0b32
--- /dev/null
+++ b/smtweb-system/sw-system-bpm/src/main/java/cc/smtweb/system/bpm/web/design/table/ModelCatalogTreeHelper.java
@@ -0,0 +1,34 @@
+package cc.smtweb.system.bpm.web.design.table;
+
+import cc.smtweb.framework.core.common.SwConsts;
+import cc.smtweb.framework.core.db.vo.ModelCatalog;
+import cc.smtweb.framework.core.mvc.service.TreeHelper;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.List;
+
+/**
+ * Created by Akmm at 2022/3/25 10:47
+ */
+public class ModelCatalogTreeHelper extends TreeHelper<ModelCatalog> {
+    //按项目的缓存key，确保此表缓存配置：prj：prjid_parentid
+    private final static String CACHE_KEY = "prj";
+
+    public ModelCatalogTreeHelper() {
+        super(ModelCatalog.ENTITY_NAME);
+    }
+
+    public List<ModelCatalog> getChildren(long id, long prj_id, Comparator<ModelCatalog> comparator) {
+        if (id > 0) {
+            return getChildren(id, comparator);
+        }
+        Collection<ModelCatalog> set = cache.getListByKey(CACHE_KEY, prj_id + SwConsts.SPLIT_CHAR + SwConsts.DEF_ROOT_ID);
+
+        List<ModelCatalog> list = set == null ? new ArrayList<>() : new ArrayList<>(set);
+        if (comparator != null)
+            list.sort(comparator);
+        return list;
+    }
+}