diff --git a/zhuike/src/main/java/com/novelbook/android/ReadActivity.java b/zhuike/src/main/java/com/novelbook/android/ReadActivity.java
index b423101..217eb80 100644
--- a/zhuike/src/main/java/com/novelbook/android/ReadActivity.java
+++ b/zhuike/src/main/java/com/novelbook/android/ReadActivity.java
@@ -604,7 +604,7 @@ public class ReadActivity extends  Activity_base implements   AdInterface {
         }
 
             if(!pageFactory.canExitSilent()){
-                if(book.isOnShelf()){
+                if(book.isOnShelf() ||pageFactory.getChapters().size()>0){
                     finish();
                 }else {
                    // showNormalDialog();
diff --git a/zhuike/src/main/java/com/novelbook/android/utils/BookUtil.java b/zhuike/src/main/java/com/novelbook/android/utils/BookUtil.java
index 9c041a4..9f70ebd 100644
--- a/zhuike/src/main/java/com/novelbook/android/utils/BookUtil.java
+++ b/zhuike/src/main/java/com/novelbook/android/utils/BookUtil.java
@@ -496,7 +496,8 @@ public class BookUtil {
         chaptCache.clear();
         fileRetryCnt.clear();
         siteRuleRetryCnt=0;
-        caprint.clear();
+        isChangeSource=false;
+
     }
 
     public Site getSite() {
@@ -582,7 +583,7 @@ public class BookUtil {
 
                 int chId=chapId;//chapterNo;
                 String title ="";
-                mChangeChapId = mChangeChapId >=1 ?mChangeChapId :1;//TODO: mChangeChapId 换源时不要变
+                mChangeChapId = mChangeChapId >=1 ?mChangeChapId :1;
                 if( mChapters.size() >= mChangeChapId && mChapters.get(mChangeChapId-1)!=null ){
                     title= mChapters.get(mChangeChapId-1).getChapterName();
                     Log.d(TAG, "changing Source:chapter name in new site " + title );
@@ -671,10 +672,10 @@ public class BookUtil {
             chapTitle = params[2];
 
             int splet =0;
-            while(isChangeSource && splet <200){
+            while(isChangeSource && splet <Constants.MAX_SLEEP_4_CHAPT_DOWNLOAD){
                 try {
                     Thread.sleep(50);
-                    splet++;
+                    splet+=50;
                     Log.d(TAG, String.format("prepare book changing Source slept %s,isChangeSource %s ", splet, isChangeSource ));
                 } catch (InterruptedException e) {
                     e.printStackTrace();
@@ -1479,8 +1480,6 @@ int muluRetryCount =0;
      return  true;
  }
 
-    List<Integer> caprint = new ArrayList<Integer>();
-
     //获取chapter 缓存
     public char[] chaptChars(final int index) {
       //  Log.d(TAG, String.format("prepare book  begin to load content for chapter %s ------------------------------------------------------------------------->", index));
@@ -1489,10 +1488,6 @@ int muluRetryCount =0;
             block = chaptCache .get(index).getData().get();
          //   Log.d(TAG, String.format("chaptChars  get block in cache, chapter: %s", index));
 
-            if(!caprint.contains(index)) {
-                caprint.add(index);
-             //   Log.d(TAG, String.format("chaptChars: load from cache chaptId %s,--->%s", index, new String(block)));
-            }
         }
       //  Log.d(TAG, String.format("prepare book  begin to load content for chapter %s", index));
         if (block == null) {
@@ -1873,5 +1868,10 @@ private void loadChaptContent(final int chapterIndex) throws JSONException, Inte
         return (line.length() <= 30 && (line.matches(".*第.{1,8}章.*") || line.matches(".*第.{1,8}节.*")))  ;
     }
 
+void clear(){
+        clearBook();
+        mContext=null;
+        this.pagefactory =null;
 
 }
+}
diff --git a/zhuike/src/main/java/com/novelbook/android/utils/PageFactory.java b/zhuike/src/main/java/com/novelbook/android/utils/PageFactory.java
index 99acff7..c8c924a 100644
--- a/zhuike/src/main/java/com/novelbook/android/utils/PageFactory.java
+++ b/zhuike/src/main/java/com/novelbook/android/utils/PageFactory.java
@@ -317,7 +317,7 @@ public class PageFactory implements ChangeSource{
          if(!getNovel().isLocalBook()) {
 
              mStatus = Status.OPENING;
-            final int maxSleep = Constants.MAX_SLEEP_4_CHAPT_DOWNLOAD;
+            final int maxSleep = Constants.MAX_SLEEP_4_CHAPT_DOWNLOAD+1000;
 
           // final File file = new File(getChapterFileName(chaptId));
 
@@ -1478,6 +1478,10 @@ private void hideSysUI(){
             }
 
         }
+        if(mBookUtil!=null){
+           mBookUtil. clear();
+           mBookUtil=null;
+        }
         mBookUtil = new BookUtil();
         mBookUtil.pagefactory=this;
         //this.mBookUtil.setContext(context);