diff --git a/Classes/ELCImagePicker/ELCAssetCell.m b/Classes/ELCImagePicker/ELCAssetCell.m
index d456b11..c97d8e4 100755
--- a/Classes/ELCImagePicker/ELCAssetCell.m
+++ b/Classes/ELCImagePicker/ELCAssetCell.m
@@ -97,18 +97,23 @@ - (void)cellTapped:(UITapGestureRecognizer *)tapRecognizer
 	for (int i = 0; i < [_rowAssets count]; ++i) {
         if (CGRectContainsPoint(frame, point)) {
             ELCAsset *asset = [_rowAssets objectAtIndex:i];
+            BOOL lastSelectedState = asset.selected;
             asset.selected = !asset.selected;
             ELCOverlayImageView *overlayView = [_overlayViewArray objectAtIndex:i];
             overlayView.hidden = !asset.selected;
-            if (asset.selected) {
-                asset.index = [[ELCConsole mainConsole] numOfSelectedElements];
-                [overlayView setIndex:asset.index+1];
-                [[ELCConsole mainConsole] addIndex:asset.index];
-            }
-            else
-            {
-                int lastElement = [[ELCConsole mainConsole] numOfSelectedElements] - 1;
-                [[ELCConsole mainConsole] removeIndex:lastElement];
+            if (lastSelectedState==asset.selected) {
+                //do nothing.
+            }else{
+                if (asset.selected) {
+                    asset.index = [[ELCConsole mainConsole] numOfSelectedElements];
+                    [overlayView setIndex:asset.index+1];
+                    [[ELCConsole mainConsole] addIndex:asset.index];
+                }
+                else
+                {
+                    int lastElement = [[ELCConsole mainConsole] numOfSelectedElements] - 1;
+                    [[ELCConsole mainConsole] removeIndex:lastElement];
+                }
             }
             break;
         }