diff --git a/README.md b/README.md
index 7230c3b..d67c257 100644
--- a/README.md
+++ b/README.md
@@ -88,7 +88,7 @@ UPDATE `test`.`test3` SET `addtime`='2016-12-10 13:03:22', `data`='中文', `id`
 
 -K, --no-primary-key 对INSERT语句去除主键。可选。
 
--B, --flashback 生成回滚语句，可解析大文件，不受内存限制。可选。与stop-never或no-primary-key不能同时添加。
+-B, --flashback 生成回滚语句，可解析大文件，不受内存限制，每打印一千行加一句SLEEP SELECT(1)。可选。与stop-never或no-primary-key不能同时添加。
 
 **解析范围控制**
 
diff --git a/binlog2sql/binlog2sql.py b/binlog2sql/binlog2sql.py
index a343433..53d029d 100755
--- a/binlog2sql/binlog2sql.py
+++ b/binlog2sql/binlog2sql.py
@@ -100,16 +100,28 @@ class Binlog2sql(object):
                 if flagLastEvent:
                     break
             ftmp.close()
+
             if self.flashback:
-                with open(tmpFile) as ftmp:
-                    for line in reversed_lines(ftmp):
-                        print line.rstrip()
+                self.print_rollback_sql(tmpFile)
         finally:
             os.remove(tmpFile)
         cur.close()
         stream.close()
         return True
 
+    def print_rollback_sql(self, fin):
+        '''print rollback sql from tmpfile'''
+        with open(fin) as ftmp:
+            sleepInterval = 1000
+            i = 0
+            for line in reversed_lines(ftmp):
+                print line.rstrip()
+                if i >= sleepInterval:
+                    print 'SELECT SLEEP(1);'
+                    i = 0
+                else:
+                    i += 1
+
     def __del__(self):
         pass