diff --git a/app/src/main/java/com/hiroshi/cimoc/source/CCMH.java b/app/src/main/java/com/hiroshi/cimoc/source/CCMH.java
index 3bc4798a..e17aa069 100644
--- a/app/src/main/java/com/hiroshi/cimoc/source/CCMH.java
+++ b/app/src/main/java/com/hiroshi/cimoc/source/CCMH.java
@@ -156,7 +156,7 @@ public List<ImageUrl> parseImages(String html, Chapter chapter) {
         for (int i = 0; i < pageCount; i++) {
             Long comicChapter = chapter.getId();
             Long id = Long.parseLong(comicChapter + "000" + i);
-            list.add(new ImageUrl(id, comicChapter, i, StringUtils.format("http://m.ccmh6.com/manhua/%s/%s.html?p=%d", _cid, _path, i + 1), true));
+            list.add(new ImageUrl(id, comicChapter, i+1, StringUtils.format("http://m.ccmh6.com/manhua/%s/%s.html?p=%d", _cid, _path, i + 1), true));
         }
         return list;
     }
diff --git a/app/src/main/java/com/hiroshi/cimoc/source/JMTT.java b/app/src/main/java/com/hiroshi/cimoc/source/JMTT.java
index 2447221f..fa6e36cc 100644
--- a/app/src/main/java/com/hiroshi/cimoc/source/JMTT.java
+++ b/app/src/main/java/com/hiroshi/cimoc/source/JMTT.java
@@ -135,9 +135,9 @@ public List<ImageUrl> parseImages(String html, Chapter chapter) {
                 String img2 = node.attr("img","data-original");
                 String reg[] = imgpath.split("\\/");
                 if (img1.contains(reg[2])){
-                    list.add(new ImageUrl(id, comicChapter, i++, img1, false));
+                    list.add(new ImageUrl(id, comicChapter, ++i, img1, false));
                 }else if (img2.contains(reg[2])){
-                    list.add(new ImageUrl(id, comicChapter, i++, img2, false));
+                    list.add(new ImageUrl(id, comicChapter, ++i, img2, false));
                 }
             }
         } catch (Exception e){
diff --git a/app/src/main/java/com/hiroshi/cimoc/source/MH517.java b/app/src/main/java/com/hiroshi/cimoc/source/MH517.java
index ab05ca5b..1abb73e5 100644
--- a/app/src/main/java/com/hiroshi/cimoc/source/MH517.java
+++ b/app/src/main/java/com/hiroshi/cimoc/source/MH517.java
@@ -130,7 +130,7 @@ public List<ImageUrl> parseImages(String html, Chapter chapter) {
 
                 Long comicChapter = chapter.getId();
                 Long id = Long.parseLong(comicChapter + "000" + i);
-                list.add(new ImageUrl(id, comicChapter, i++, url, false));
+                list.add(new ImageUrl(id, comicChapter, ++i, url, false));
             }
         } finally {
             return list;
diff --git a/app/src/main/java/com/hiroshi/cimoc/source/QiMiaoMH.java b/app/src/main/java/com/hiroshi/cimoc/source/QiMiaoMH.java
index ce794326..52437d5b 100644
--- a/app/src/main/java/com/hiroshi/cimoc/source/QiMiaoMH.java
+++ b/app/src/main/java/com/hiroshi/cimoc/source/QiMiaoMH.java
@@ -131,7 +131,7 @@ public List<ImageUrl> parseImages(String html, Chapter chapter) throws Manga.Net
             for (int i = 0; i < jsonArray.length(); ++i) {
                 Long comicChapter = chapter.getId();
                 Long id = Long.parseLong(comicChapter + "000" + i);
-                list.add(new ImageUrl(id, comicChapter, i, jsonArray.getString(i), false));
+                list.add(new ImageUrl(id, comicChapter, i + 1, jsonArray.getString(i), false));
             }
         } catch (JSONException e) {
             e.printStackTrace();
diff --git a/app/src/main/java/com/hiroshi/cimoc/source/WebtoonDongManManHua.java b/app/src/main/java/com/hiroshi/cimoc/source/WebtoonDongManManHua.java
index cd87f2f7..746adf99 100644
--- a/app/src/main/java/com/hiroshi/cimoc/source/WebtoonDongManManHua.java
+++ b/app/src/main/java/com/hiroshi/cimoc/source/WebtoonDongManManHua.java
@@ -178,8 +178,7 @@ public List<ImageUrl> parseImages(String html, Chapter chapter) {
                 if (key.contains("layer")) {
                     Long comicChapter = chapter.getId();
                     Long id = Long.parseLong(comicChapter + "000" + i);
-                    list.add(new ImageUrl(id, comicChapter, i, motiontoonPath + motiontoonJson.getString(key), false));
-                    i++;
+                    list.add(new ImageUrl(id, comicChapter, i++, motiontoonPath + motiontoonJson.getString(key), false));
                 }
             }
         } catch (Manga.NetworkErrorException e) {
diff --git a/app/src/main/java/com/hiroshi/cimoc/ui/adapter/ReaderAdapter.java b/app/src/main/java/com/hiroshi/cimoc/ui/adapter/ReaderAdapter.java
index 0f6f8215..87cb68b2 100644
--- a/app/src/main/java/com/hiroshi/cimoc/ui/adapter/ReaderAdapter.java
+++ b/app/src/main/java/com/hiroshi/cimoc/ui/adapter/ReaderAdapter.java
@@ -238,10 +238,15 @@ public void getItemOffsets(Rect outRect, View view, RecyclerView parent, Recycle
      * 假设一定找得到
      */
     public int getPositionByNum(int current, int num, boolean reverse) {
-        while (mDataSet.get(current).getNum() != num) {
-            current = reverse ? current - 1 : current + 1;
+        try {
+            while (mDataSet.get(current).getNum() < num) {
+                current = reverse ? current - 1 : current + 2;
+            }
+        }catch (Exception e){
+            e.printStackTrace();
+        }finally {
+            return current;
         }
-        return current;
     }
 
     public int getPositionById(Long id) {