diff --git a/packages/mip/src/util/event-action.js b/packages/mip/src/util/event-action.js
index 3b3e8cff..b9926fd4 100644
--- a/packages/mip/src/util/event-action.js
+++ b/packages/mip/src/util/event-action.js
@@ -24,7 +24,7 @@ const PARSE_REG = /^(\w+):\s*([\w-]+)\.([\w-$]+)(?:\((.+)\))?$/
  * @inner
  * @type {RegExp}
  */
-const EVENT_ARG_REG = /^event(\.[a-zA-Z_][\w_]+)+$/g
+const EVENT_ARG_REG = /^event(\.[a-zA-Z_][\w_]*)+$/g
 // const EVENT_ARG_REG_FOR_OBJECT = /(:\s*)(event(\.[a-zA-Z]\w+)+)(\s*[,}])/g
 
 /**
diff --git a/packages/mip/test/specs/util/event-action.spec.js b/packages/mip/test/specs/util/event-action.spec.js
index db0797b4..3141f41d 100644
--- a/packages/mip/test/specs/util/event-action.spec.js
+++ b/packages/mip/test/specs/util/event-action.spec.js
@@ -194,6 +194,7 @@ describe('split', () => {
 describe('handleArguments', () => {
   let action = new EventAction()
   let event = {
+    _: 0,
     one: 1,
     two: 2,
     nest: {
@@ -204,6 +205,7 @@ describe('handleArguments', () => {
     bool: true
   }
   it('should get event value', () => {
+    expect(action.handleArguments('event._', event)).to.equal('0')
     expect(action.handleArguments('event.one', event)).to.equal('1')
     expect(action.handleArguments(' event.one ', event)).to.equal('1')
     expect(action.handleArguments('event.three', event)).to.equal('undefined')