diff --git a/python/paddle/fluid/layers/layer_function_generator.py b/python/paddle/fluid/layers/layer_function_generator.py
index 0f05ea2b08dce7df531ef9637e7004e0370e4798..7a95afa9a6c370adbc13f4cb77526e316033899a 100644
--- a/python/paddle/fluid/layers/layer_function_generator.py
+++ b/python/paddle/fluid/layers/layer_function_generator.py
@@ -76,7 +76,6 @@ def _generate_doc_string_(op_proto):
         line_begin = '    {0}: '.format(_convert_(each_input.name))
         buf.write(line_begin)
         buf.write(escape_math(each_input.comment))
-        buf.write('\n')
         if each_input.duplicable:
             buf.write("  Duplicatable.")
         if each_input.dispensable: