diff --git a/dist/regular.js b/dist/regular.js
index 0538cf5..d4ed743 100644
--- a/dist/regular.js
+++ b/dist/regular.js
@@ -880,7 +880,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	  }
 	  return paramObj;
 	}
-	_.eventReg = /^on-(\w[-\w]+)$/;
+	_.eventReg = /^on-(\w[-\w]*)$/;
 
 	_.toText = function(obj){
 	  return obj == null ? "": "" + obj;
@@ -4906,12 +4906,16 @@ return /******/ (function(modules) { // webpackBootstrap
 	      value = self._touchExpr(value);
 	      // use bit operate to control scope
 	      if( !(isolate & 2) )
+	        // sync data from parent to child
 	        this.$watch(value, (function(name, val){
 	          this.data[name] = val;
 	        }).bind(component, name), OPTIONS.SYNC)
 	      if( value.set && !(isolate & 1 ) )
-	        // sync the data. it force the component don't trigger attr.name's first dirty echeck
-	        component.$watch(name, self.$update.bind(self, value), OPTIONS.INIT);
+	        // sync data from child to parent. it force the component don't trigger attr.name's first dirty echeck
+	        component.$watch(name, self.$update.bind(self, value), {
+	          init: true,
+	          last: this.data[ name ]
+	        });
 	    }
 	  }
 	  if(is && is.type === 'expression'  ){
diff --git a/dist/regular.min.js b/dist/regular.min.js
index a971a1b..c1ba902 100644
--- a/dist/regular.min.js
+++ b/dist/regular.min.js
@@ -3,7 +3,6 @@
 @version	0.6.0
 @homepage	http://regularjs.github.io
 */
-!function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e():"function"==typeof define&&define.amd?define([],e):"object"==typeof exports?exports.Regular=e():t.Regular=e()}(this,function(){return function(t){function e(r){if(n[r])return n[r].exports;var i=n[r]={exports:{},id:r,loaded:!1};return t[r].call(i.exports,i,i.exports,e),i.loaded=!0,i.exports}var n={};return e.m=t,e.c=n,e.p="",e(0)}([function(t,e,n){var r=n(1),i=n(8),o=t.exports=n(9),a=o.Parser,s=o.Lexer;n(29),n(32),n(33),o.dom=n(17),o.env=r,o.util=n(3),o.parse=function(t,e){e=e||{},(e.BEGIN||e.END)&&(e.BEGIN&&(i.BEGIN=e.BEGIN),e.END&&(i.END=e.END),s.setup());var n=new a(t).parse();return e.stringify?JSON.stringify(n):n},o.Cursor=n(25),o.isServer=r.node,o.isRegular=function(t){return t.prototype instanceof o}},function(t,e,n){(function(t){var r=n(3);e.svg=function(){return"undefined"!=typeof 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e&&!t.test&&("object"===a&&t.deep||"array"===a?t.last=i.clone(n):t.last=n,t.fn.call(this,n,r,l,p&&p.oldKeyMap,p&&p.dirty),t.once&&this.$unwatch(t)),e}},$set:function(t,e){if(null!=t){var n=typeof t;if("string"===n||"expression"===t.type)t=this.$expression(t),t.set(this,e);else if("function"===n)t.call(this,this.data);else for(var r in t)this.$set(r,t[r])}},$get:function(t,e){return e&&"string"==typeof t?t:this.$expression(t).get(this)},$update:function(){var t=this;if("destroyed"===t.$phase)return this;do{if(t.data.isolate||!t.$parent)break;t=t.$parent}while(t);var e=t.$phase;return t.$phase="digest",this.$set.apply(this,arguments),t.$phase=e,t.$digest(),this},_record:function(){this._records||(this._records=[]),this._records.push([])},_release:function(){return this._records.pop()}};i.extend(r.prototype,f),r.mixTo=function(t){return t="function"==typeof t?t.prototype:t,i.extend(t,f)},t.exports=r},function(t,e){var n=t.exports={};n.json={get:function(t){return"undefined"!=typeof JSON?JSON.stringify(t):t},set:function(t){return"undefined"!=typeof JSON?JSON.parse(t):t}},n.last=function(t){return t&&t[t.length-1]},n.average=function(t,e){return t=t||[],t.length?n.total(t,e)/t.length:0},n.total=function(t,e){var n=0;if(t)return t.forEach(function(t){n+=e?t[e]:t}),n}},function(t,e,n){var r=n(3),i=n(17),o=(n(23),n(9)),a=n(18),s=a.NAMESPACE,u=a.OPTIONS,c=u.STABLE,f={deep:!0,stable:!0};n(30),n(31),t.exports={"r-class":function(t,e){"string"==typeof e&&(e=r.fixObjStr(e));var n=t.namespaceURI&&t.namespaceURI!==s.html;this.$watch(e,function(e){var r=n?t.getAttribute("class"):t.className;r=" "+(r||"").replace(/\s+/g," ")+" ";for(var o in e)e.hasOwnProperty(o)&&(r=r.replace(" "+o+" "," "),e[o]===!0&&(r+=o+" "));r=r.trim(),n?i.attr(t,"class",r):t.className=r},f)},"r-style":function(t,e){"string"==typeof e&&(e=r.fixObjStr(e)),this.$watch(e,function(e,n){for(var r in n)n.hasOwnProperty(r)&&!e.hasOwnProperty(r)&&i.css(t,r,"");for(r in e)e.hasOwnProperty(r)&&i.css(t,r,e[r])},f)},"r-hide":{link:function(t,e){var n,i=null;r.isExpr(e)||"string"==typeof e?this.$watch(e,function(e){var r=!!e;r!==i&&(i=r,r?t.onleave?n=t.onleave(function(){t.style.display="none",n=null}):t.style.display="none":(n&&n(),t.style.display="",t.onenter&&t.onenter()))},c):e&&(t.style.display="none")},ssr:function(t){return t?'style="display:none"':""}},"r-html":{ssr:function(t,e){return e.body=t,""},link:function(t,e){this.$watch(e,function(e){e=e||"",i.html(t,e)},{force:!0,stable:!0})}},ref:{accept:a.COMPONENT_TYPE+a.ELEMENT_TYPE,link:function(t,e){var n,i=this.$refs||(this.$refs={});return r.isExpr(e)?this.$watch(e,function(e,r){n=e,i[r]===t&&(i[r]=null),n&&(i[n]=t)},c):i[n=e]=t,function(){i[n]=null}}}},o.directive(t.exports)},function(t,e,n){function r(t,e,n){if(n)for(var r,i=t.target;i&&i!==n;){for(var o=0,a=e.length;a>o;o++)r=e[o],r&&r.element===i&&r.fire(t);i=i.parentNode}}var 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\ No newline at end of file
diff --git a/lib/walkers.js b/lib/walkers.js
index 1f34c33..75700ca 100644
--- a/lib/walkers.js
+++ b/lib/walkers.js
@@ -713,12 +713,16 @@ walkers.component = function(ast, options){
       value = self._touchExpr(value);
       // use bit operate to control scope
       if( !(isolate & 2) )
+        // sync data from parent to child
         this.$watch(value, (function(name, val){
           this.data[name] = val;
         }).bind(component, name), OPTIONS.SYNC)
       if( value.set && !(isolate & 1 ) )
-        // sync the data. it force the component don't trigger attr.name's first dirty echeck
-        component.$watch(name, self.$update.bind(self, value), OPTIONS.INIT);
+        // sync data from child to parent. it force the component don't trigger attr.name's first dirty echeck
+        component.$watch(name, self.$update.bind(self, value), {
+          init: true,
+          last: this.data[ name ]
+        });
     }
   }
   if(is && is.type === 'expression'  ){