diff --git a/paddle/fluid/framework/ir/alloc_continuous_space_for_grad_pass.cc b/paddle/fluid/framework/ir/alloc_continuous_space_for_grad_pass.cc
index 4da889b400071f9bb4bb6476d25e2ba5957ea2ee..715ca97f3715128c6d2ccfcbb8d291f84f176a6d 100644
--- a/paddle/fluid/framework/ir/alloc_continuous_space_for_grad_pass.cc
+++ b/paddle/fluid/framework/ir/alloc_continuous_space_for_grad_pass.cc
@@ -42,6 +42,9 @@ DEFINE_int32(
 namespace paddle {
 namespace framework {
 namespace ir {
+// unit of the FLAGS_fuse_parameter_memory_size.
+static constexpr double kMB = 1048576.0;
+
 // SetFuseParameterGroupsSize and SetFuseParameterMemorySize are used in unit
 // test, because it is invalid that seting 'FLAGS_fuse_parameter_memory_size'
 // and 'FLAGS_fuse_parameter_groups_size' in unit test.
@@ -228,8 +231,8 @@ class AllocContinuousSpaceForGradPass : public ir::Pass {
       }
       VLOG(10) << out.str()
                << ", group size:" << group_grads_params->at(i).size()
-               << ", group memory size:"
-               << static_cast<double>(gps_size) / 1048576.0 << "(MB)";
+               << ", group memory size:" << static_cast<double>(gps_size) / kMB
+               << "(MB)";
     }
   }
 
@@ -270,7 +273,7 @@ class AllocContinuousSpaceForGradPass : public ir::Pass {
           break;
         }
 
-        if (static_cast<double>(local_group_memory_size) / 1048576.0 >=
+        if (static_cast<double>(local_group_memory_size) / kMB >=
             group_memory_size) {
           break;
         }
diff --git a/python/paddle/distributed/launch.py b/python/paddle/distributed/launch.py
index b685723763833321bba1c70bec32cca52268d728..06369ea6b701ec2edac781f56dd76a20cff6e6e4 100644
--- a/python/paddle/distributed/launch.py
+++ b/python/paddle/distributed/launch.py
@@ -164,6 +164,13 @@ def start_procs(args):
               ", node_ips:", node_ips, ", nranks:", nranks)
 
     current_env = copy.copy(default_env)
+    # paddle broadcast ncclUniqueId use socket, and
+    # proxy maybe make trainers unreachable, so delete them.
+    # if we set them to "", grpc will log error message "bad uri"
+    # so just delete them.
+    current_env.pop("http_proxy", None)
+    current_env.pop("https_proxy", None)
+
     procs = []
     cmds = []
     for i in range(0, selected_gpus_num):
@@ -173,11 +180,7 @@ def start_procs(args):
             "PADDLE_CURRENT_ENDPOINT":
             "%s:%d" % (current_node_ip, args.started_port + i),
             "PADDLE_TRAINERS_NUM": "%d" % nranks,
-            "PADDLE_TRAINER_ENDPOINTS": trainers_endpoints,
-            # paddle broadcast ncclUniqueId use socket, and
-            # proxy maybe make trainers unreachable, so set them to ""
-            "http_proxy": "",
-            "https_proxy": ""
+            "PADDLE_TRAINER_ENDPOINTS": trainers_endpoints
         })
 
         cmd = [sys.executable, "-u", args.training_script