diff --git a/dist/index/index.js b/dist/index/index.js
index c556f19..2690a9a 100644
--- a/dist/index/index.js
+++ b/dist/index/index.js
@@ -52,7 +52,7 @@ Component({
                         timer : null
                     })
                 }
-                
+
                 this.data.timer = setTimeout(()=>{
                     const data = [];
                     indexItems.forEach((item) => {
@@ -71,7 +71,7 @@ Component({
                 this.setData({
                     timer : this.data.timer
                 })
-                
+
             }
         },
         handlerScroll(event){
@@ -117,7 +117,7 @@ Component({
             const touches = event.touches[0] || {};
             const pageY = touches.pageY;
             const rest = pageY - data.startTop;
-            let index = Math.ceil( rest/data.itemHeight );
+            let index = Math.floor( rest/data.itemHeight );
             index = index >= data.itemLength ? data.itemLength -1 : index;
             const movePosition = this.getCurrentItem(index);
 
@@ -155,4 +155,4 @@ Component({
             }).exec()
         }
     }
-})
\ No newline at end of file
+})