diff --git a/python/paddle/v2/fluid/memory_optimization_transpiler.py b/python/paddle/v2/fluid/memory_optimization_transpiler.py
index 8bb8cf7b1a5ddf44427637229bdc31ac0e151e44..53e0991ee8c318e0c95018b57ad48f404ce8beae 100644
--- a/python/paddle/v2/fluid/memory_optimization_transpiler.py
+++ b/python/paddle/v2/fluid/memory_optimization_transpiler.py
@@ -92,14 +92,13 @@ class ControlFlowGraph(object):
         live_in = defaultdict(set)
         live_out = defaultdict(set)
         while True:
-            for i in range(self.op_size):
+            for i in range(self.op_size, 0, -1):
                 live_in[i] = set(self._live_in[i])
                 live_out[i] = set(self._live_out[i])
-                self._live_in[i] = self._uses[i] | (
-                    self._live_out[i] - self._defs[i])
                 for s in self._successors[i]:
                     self._live_out[i] |= self._live_in[s]
-
+                self._live_in[i] = self._uses[i] | (
+                    self._live_out[i] - self._defs[i])
             if self._reach_fixed_point(live_in, live_out):
                 break