diff --git a/RESTful service/project.py b/RESTful service/project.py
index 80da978..34b5274 100644
--- a/RESTful service/project.py	
+++ b/RESTful service/project.py	
@@ -3,7 +3,6 @@
 import base64
 import hmac
 import hashlib
-import urllib
 import time
 import requests
 import json
@@ -12,7 +11,7 @@
   'host': 'api.acrcloud.com',
   'signature_version': '1',
   'access_key': '<your account access key>',
-  'access_secret': '<your account access secret>',
+  'access_secret': b'<your account access secret>',
 };
 
 
@@ -28,9 +27,9 @@ def create_project(name, region, type, buckets, audio_type, external_id):
     
     string_to_sign = '\n'.join((http_method, uri, option['access_key'], option['signature_version'], str(timestamp)))
 
-    signature = sign(string_to_sign, option['access_secret'])
+    signature = sign(string_to_sign.encode(), option['access_secret'])
  
-    headers = {'access-key': option['access_key'], 'signature-version': option['signature_version'], 'signature': signature, 'timestamp':timestamp}
+    headers = {'access-key': option['access_key'], 'signature-version': option['signature_version'], 'signature': signature, 'timestamp':str(timestamp)}
 
     data = {'name':name, 'region':region, 'type':type, 'buckets':json.dumps(buckets), 'audio_type':audio_type, 'external_id':external_id}
     
@@ -47,9 +46,9 @@ def update_project(name, buckets):
     
     string_to_sign = '\n'.join((http_method, uri, option['access_key'], option['signature_version'], str(timestamp)))
 
-    signature = sign(string_to_sign, option['access_secret'])
+    signature = sign(string_to_sign.encode(), option['access_secret'])
  
-    headers = {'access-key': option['access_key'], 'signature-version': option['signature_version'], 'signature': signature, 'timestamp':timestamp}
+    headers = {'access-key': option['access_key'], 'signature-version': option['signature_version'], 'signature': signature, 'timestamp':str(timestamp)}
 
     data = {'buckets':json.dumps(buckets)}
     
@@ -65,9 +64,9 @@ def delete_project(name):
 
     string_to_sign = '\n'.join((http_method, uri, option['access_key'], option['signature_version'], str(timestamp)))
 
-    signature = sign(string_to_sign, option['access_secret'])
+    signature = sign(string_to_sign.encode(), option['access_secret'])
 
-    headers = {'access-key': option['access_key'], 'signature-version': option['signature_version'], 'signature': signature, 'timestamp':timestamp}
+    headers = {'access-key': option['access_key'], 'signature-version': option['signature_version'], 'signature': signature, 'timestamp':str(timestamp)}
 
     data = {'name':name}
 
@@ -82,8 +81,8 @@ def get_project(project_name):
     http_uri = "/v1/projects/"+project_name
 
     string_to_sign = '\n'.join((http_method, http_uri, option['access_key'], option['signature_version'], str(timestamp)))
-    signature = sign(string_to_sign, option['access_secret'])
-    headers = {'access-key': option['access_key'], 'signature-version': option['signature_version'], 'signature': signature, 'timestamp':timestamp}
+    signature = sign(string_to_sign.encode(), option['access_secret'])
+    headers = {'access-key': option['access_key'], 'signature-version': option['signature_version'], 'signature': signature, 'timestamp':str(timestamp)}
 
     requrl = "https://"+option['host'] + http_uri
     r = requests.get(requrl, headers=headers, verify=True)
@@ -96,8 +95,8 @@ def list_projects():
     http_uri = "/v1/projects"
 
     string_to_sign = '\n'.join((http_method, http_uri, option['access_key'], option['signature_version'], str(timestamp)))
-    signature = sign(string_to_sign, option['access_secret'])
-    headers = {'access-key': option['access_key'], 'signature-version': option['signature_version'], 'signature': signature, 'timestamp':timestamp}
+    signature = sign(string_to_sign.encode(), option['access_secret'])
+    headers = {'access-key': option['access_key'], 'signature-version': option['signature_version'], 'signature': signature, 'timestamp':str(timestamp)}
 
     requrl = "https://"+option['host'] + http_uri
     r = requests.get(requrl, headers=headers, verify=True)