diff --git a/tools/rankserver/app.py b/tools/rankserver/app.py
index a1e2d99..54113c7 100644
--- a/tools/rankserver/app.py
+++ b/tools/rankserver/app.py
@@ -81,25 +81,34 @@ def readMysqlData(rushtime):
 
     r = getRedis()
     array.sort(key=take_kills, reverse=True)
-    kill_rank = json.dumps(array)
-    r.set("game2001api: kill_rank", kill_rank)
+    kill_rank = []
+    for kill_index in range(50):
+        kill_rank.append(array[kill_index])
+    r.set("game2001api: kill_rank", json.dumps(kill_rank))
 
     array.sort(key=take_alive_time, reverse=True)
-    alive_rank = json.dumps(array)
-    r.set("game2001api: alive_rank", alive_rank)
+    alive_rank = []
+    for alive_index in range(50):
+        alive_rank.append(array[alive_index])
+    r.set("game2001api: alive_rank", json.dumps(alive_rank))
 
     array.sort(key=take_harms, reverse=True)
-    harm_rank = json.dumps(array)
-    r.set("game2001api: harm_rank", harm_rank)
+    harm_rank = []
+    for harm_index in range(50):
+        harm_rank.append(array[harm_index])
+    r.set("game2001api: harm_rank", json.dumps(harm_rank))
 
     array.sort(key=take_win_times, reverse=True)
-    rate_rank = json.dumps(array)
-    r.set("game2001api: rate_rank", rate_rank)
+    rate_rank = []
+    for rate_index in range(50):
+        rate_rank.append(array[rate_index])
+    r.set("game2001api: rate_rank", json.dumps(rate_rank))
 
     array.sort(key=take_game_times, reverse=True)
-
-    win_rank = json.dumps(array)
-    r.set("game2001api: win_rank", win_rank)
+    win_rank = []
+    for win_index in range(50):
+        win_rank.append(array[win_index])
+    r.set("game2001api: win_rank", json.dumps(win_rank))
 
     tornado.ioloop.IOLoop.current().call_later(rushtime,
                                                lambda : readMysqlData(rushtime)