diff --git a/tools/replaceService.py b/tools/replaceService.py
new file mode 100755
index 0000000000000000000000000000000000000000..a6dc5e8464410415c58a1e52d8654010be23c1c0
--- /dev/null
+++ b/tools/replaceService.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+
+# repalce "tar_scm_kernel" with "tar_scm" in _service and insert extract_file into _service
+# USAGE：python3 replaceService.py <OBS_DIR> or python3 replaceService.py <OBS_DIR> <SAVE_DIR>
+# if you want to save the names of packages which do not have _service files or do not use tar_scm_kernel
+# you can use python3 replaceService.py <OBS_DIR> <SAVE_DIR>
+# <SAVE_DIR> is the path you define to save the packages names
+# if not you can use python3 replaceService.py <OBS_DIR>
+# <OBS_DIR> is the path of your OBS project
+
+import sys
+import os
+import shutil
+
+def handle_service(service,save):
+    file = service + "/" + "_service"
+    temp_file = file + ".temp"
+    
+    if(not os.path.exists(file)):
+        if (save != ""):
+            save_not_exist_packages(service,save)
+        return
+    else:
+        lens_origin,lens_insert = replace_service(file,temp_file)
+        if (save != ""):
+            save_not_replace_packages(lens_origin,lens_insert,service,save)         
+    os.remove(file)
+    os.rename(temp_file, file)
+
+def save_not_exist_packages(service,save):
+    """save the names of packages which do not have the _service file"""
+    not_exist_file = save + "/not_exist_file"
+    print("not exist:" + service)
+    with open(not_exist_file, mode='a+') as fw:
+        fw.write(service+"\n")
+    fw.close()
+    
+def save_not_replace_packages(lens_origin,lens_insert,service,save):
+    """"save the names of packages which do not use tar_scm_kernel or have been replaced """
+    not_change_file = save + "/not_change_file"
+    with open(not_change_file, mode='a+') as fw:
+        if (lens_origin == lens_insert):
+            print("not change:" + service)
+            fw.write(service+"\n")
+        fw.close()
+    
+def replace_service(file,temp_file):
+    """replace tar_scm_kenel to tar_scm and insert extract_file"""
+    with open(file, mode='r') as fr, open(temp_file, mode='w') as fw:
+        origin_line = '<service name="tar_scm_kernel">'
+        update_line = '<service name="tar_scm">'
+        #hit_line = '</service>'
+        insert_lines = '    <service name="extract_file">\n' + '      <param name="archive">*.tar</param>\n' + '      <param name="files">*/*</param>\n' + '    </service>\n'
+        lines = fr.readlines()
+        lens_origin = len(lines)
+        #print(lens_origin)
+        #some service files have been replacesd already or do not use tar_scm_kernel
+        #so only files having tar_scm_kernel will be inserted extract_file
+        for l in lines:
+            if origin_line in l:
+                #print(service+" changes and inserts extract file")
+                lines.insert(lens_origin-2,insert_lines)
+        lens_insert = len(lines)
+        #print(lens_insert)
+        fr.close()
+        for line in lines:
+            fw.write(line.replace(origin_line,update_line))
+        fw.close()
+        return lens_origin,lens_insert
+
+if __name__ == '__main__':
+    obs_dir = sys.argv[1]
+    if (len(sys.argv)>2):
+        save_dir = sys.argv[2]
+    else:
+        save_dir = ""
+    for package in sorted(os.listdir(obs_dir)):
+        #print(dir)
+        if package.startswith('.'):
+            continue
+        service_dir = obs_dir + "/" + package
+        #print(service_dir)
+        handle_service(service_dir,save_dir)