diff --git a/doc/fluid/design/async_executor/async_executor.md b/doc/fluid/design/async_executor/async_executor.md
index 38f2aa38ab0d26fe2ca7bd6d4633008652bf6cd5..ef2e003552bf192fd45062475294ad48057e7dfe 100644
--- a/doc/fluid/design/async_executor/async_executor.md
+++ b/doc/fluid/design/async_executor/async_executor.md
@@ -13,8 +13,6 @@ def train_loop():
     avg_cost, acc, prediction = bow_net(data, label)
     sgd_optimizer = fluid.optimizer.Adagrad(learning_rate=0.002)
     opt_ops, weight_and_grad = sgd_optimizer.minimize(avg_cost)
-    startup_program = fluid.default_startup_program()
-    main_program = fluid.default_main_program()
     place = fluid.CPUPlace()
     executor = fluid.Executor(place)
     executor.run(startup_program)