diff --git a/imperative/python/megengine/tools/load_network_and_run.py b/imperative/python/megengine/tools/load_network_and_run.py
index d226ad1aef49c75a1858c561fde348ed1d59e210..1012e06fccfce558a494b610ef72ba56994eff85 100755
--- a/imperative/python/megengine/tools/load_network_and_run.py
+++ b/imperative/python/megengine/tools/load_network_and_run.py
@@ -121,6 +121,9 @@ def run_model(args, graph, inputs, outputs, data):
     # must use level0 to avoid unintended opr modification
     graph.options.graph_opt_level = 0
 
+    if args.weight_preprocess:
+        graph.enable_weight_preprocess()
+
     logger.info("input tensors: ")
     for k, v in data.items():
         logger.info("  {}: {}".format(k, v.shape))
@@ -161,8 +164,8 @@ def run_model(args, graph, inputs, outputs, data):
         func.wait()
         return [oup_node.get_value().numpy() for oup_node in output_dict.values()]
 
-    if args.warm_up:
-        logger.info("warming up")
+    for i in range(args.warm_up):
+        logger.info("warming up {}".format(i))
         run()
 
     total_time = 0
@@ -276,8 +279,9 @@ def main():
     )
     parser.add_argument(
         "--warm-up",
-        action="store_true",
-        help="warm up model before do timing " " for better estimation",
+        type=int,
+        default=0,
+        help="times of warm up model before do timing " " for better estimation",
     )
     parser.add_argument(
         "--verbose",
@@ -394,6 +398,13 @@ def main():
     parser.add_argument(
         "--custom-op-lib", type=str, help="path of the custom op",
     )
+    parser.add_argument(
+        "--weight-preprocess",
+        action="store_true",
+        help="Execute operators with weight preprocess, which can"
+        "optimize the operator execution time with algo of winograd,"
+        "im2col ,etc.,but it may consume more memory.",
+    )
 
     args = parser.parse_args()
 
diff --git a/imperative/python/src/graph_rt.cpp b/imperative/python/src/graph_rt.cpp
index de7f28b99ae6da0c4f7143407af9a3c9ee80364a..a6085aef1b405939551452c4c879e44e20901307 100644
--- a/imperative/python/src/graph_rt.cpp
+++ b/imperative/python/src/graph_rt.cpp
@@ -253,6 +253,10 @@ void init_graph_rt(py::module m) {
                              }
                              return graph.compile(spec);
                          })
+                    .def("enable_weight_preprocess",
+                         [](cg::ComputingGraph& graph) {
+                             graph.options().graph_opt.enable_weight_preprocess();
+                         })
                     .def_property_readonly(
                             "options",
                             py::overload_cast<>(&cg::ComputingGraph::options));