diff --git a/python/paddle/fluid/transpiler/distribute_transpiler.py b/python/paddle/fluid/transpiler/distribute_transpiler.py
index b71bd48baff0ea6041e9e99a9bab2191900ae823..c10a1348ec462d1f3ed1c460376515e7632cbf7f 100644
--- a/python/paddle/fluid/transpiler/distribute_transpiler.py
+++ b/python/paddle/fluid/transpiler/distribute_transpiler.py
@@ -767,7 +767,7 @@ in a single call.")
             prefetch_var_name_to_block_id.extend(
                 lookup_table_var_name_to_block_id)
 
-        if optimize_blocks.size() == 0:
+        if len(optimize_blocks) == 0:
             pre_block_idx = pserver_program.num_blocks - 1
             empty_block = pserver_program._create_block(pre_block_idx)
             optimize_blocks.append(empty_block)