diff --git a/Ifish/views/introductionView/MyIntroductionViewController.m b/Ifish/views/introductionView/MyIntroductionViewController.m
index 485ecd1..792145c 100644
--- a/Ifish/views/introductionView/MyIntroductionViewController.m
+++ b/Ifish/views/introductionView/MyIntroductionViewController.m
@@ -94,21 +94,18 @@ static MyIntroductionViewController * introduction = nil;
 }
 
 -(void)setUpScrollView{
-    self.scrollView.contentSize = CGSizeMake(self.scrollView.bounds.size.width*self.imageNames.count, self.scrollView.bounds.size.height);
+    CGFloat width = CGRectGetWidth([UIScreen mainScreen].bounds);
+    CGFloat height = CGRectGetHeight([UIScreen mainScreen].bounds);
+    self.scrollView.contentSize = CGSizeMake(width * self.imageNames.count, height);
     self.scrollView.bounces=NO;
     //views
     for (int i=0; i<self.imageNames.count; i++) {
         UIImageView * imgV = [[UIImageView alloc]initWithImage:[UIImage imageNamed:self.imageNames[i]]];
         imgV.userInteractionEnabled=true;
-        CGRect frame = imgV.frame;
-        CGFloat oldH = imgV.bounds.size.height;
-        CGFloat oldW = imgV.bounds.size.width;
-        if (frame.size.width>self.scrollView.frame.size.width) {
-            frame.size.width = self.scrollView.bounds.size.width;
-            frame.size.height = frame.size.width * oldH / oldW;
-            imgV.frame = frame;
-        }
-        imgV.center = CGPointMake((i+0.5)*self.scrollView.bounds.size.width, self.scrollView.bounds.size.height/2);
+        imgV.contentMode = UIViewContentModeScaleAspectFill;
+        imgV.layer.masksToBounds = YES;
+        CGFloat x = i * width;
+        imgV.frame = CGRectMake(x, 0, width, height);
         [self.scrollView addSubview:imgV];
         [self.imageViews addObject:imgV];
     }