diff --git a/src/models/bo/property.ts b/src/models/bo/property.ts
index f5297b2..d0ca8b8 100644
--- a/src/models/bo/property.ts
+++ b/src/models/bo/property.ts
@@ -33,7 +33,7 @@ export default class Property extends Model<Property> {
 
   @AllowNull(false)
   @Column({
-    type: DataType.ENUM(TYPES.STRING, TYPES.NUMBER, TYPES.BOOLEAN, TYPES.OBJECT, TYPES.ARRAY, TYPES.FUNCTION, TYPES.REGEXP),
+    type: DataType.ENUM(TYPES.STRING, TYPES.NUMBER, TYPES.BOOLEAN, TYPES.OBJECT, TYPES.ARRAY, TYPES.FUNCTION, TYPES.REGEXP, TYPES.Null),
     comment: 'property type',
   })
   /** Data Type */
diff --git a/src/routes/utils/tree.ts b/src/routes/utils/tree.ts
index eafc758..4f92813 100644
--- a/src/routes/utils/tree.ts
+++ b/src/routes/utils/tree.ts
@@ -108,6 +108,10 @@ export default class Tree {
               })
             }
             break
+          case 'Null':
+              // tslint:disable-next-line: no-null-keyword
+              result[item.name + rule] = null
+              break
         }
       }
     }
diff --git a/src/scripts/init/bo.ts b/src/scripts/init/bo.ts
index b173ddc..d43d17e 100644
--- a/src/scripts/init/bo.ts
+++ b/src/scripts/init/bo.ts
@@ -2,7 +2,7 @@ import { mock } from 'mockjs'
 
 const scopes = ['request', 'response']
 const methods = ['GET', 'POST', 'PUT', 'DELETE']
-const types = ['String', 'Number', 'Boolean', 'Object', 'Array', 'Function', 'RegExp']
+const types = ['String', 'Number', 'Boolean', 'Object', 'Array', 'Function', 'RegExp', 'Null']
 const values = ['@INT', '@FLOAT', '@TITLE', '@NAME']
 
 let USER_ID = 100000000