diff --git a/kunlun.py b/kunlun.py
index a48f465..3b17732 100644
--- a/kunlun.py
+++ b/kunlun.py
@@ -295,11 +295,15 @@ def global_def():
     global time_stamp_end
     global function_type
     global upload_key
+
+    arg_num=len(sys.argv)
+    if(arg_num<=1):
+        return
+
     init_str="WQKL"
     serial_com=sys.argv[1]
     b_rate=115200
     nb_rate=1500000
-    arg_num=len(sys.argv)
     def set_upload():
         global function_type
         if(sys.argv[3].endswith('.bin')):
@@ -328,17 +332,16 @@ def global_def():
     if(function_type=='upload'):
         ram_file=f'bootram_{sys.argv[2]}.bin'
         iot_flash_file=sys.argv[3]
+        ram_file=os.path.join(bin_path(),ram_file)
     elif(function_type=='download'):
         ram_file=f'{sys.argv[2]}_ram_build.bin'
         iot_flash_file=sys.argv[3]
+        ram_file=os.path.join(bin_path(),ram_file)
     elif(function_type=='ram'):
         ram_file=sys.argv[2]
         iot_flash_file=sys.argv[2]
-        return
     elif(function_type=='convert'):
         iot_flash_file=sys.argv[1]
-        return
-    ram_file=os.path.join(bin_path(),ram_file)
 
 
 def print_help():