diff --git a/README.md b/README.md
index e6c3f7b..835e3b5 100644
--- a/README.md
+++ b/README.md
@@ -3,9 +3,11 @@
 
 ### 环境
  * Linux Mint 18.2 Cinnamon 64-bit
- * python 3.5.2
+ * python 3.5.2 or 2.7.12
  * scikit-learn 0.19.1
  * Pillow 4.3.0
+ * scipy
+ * numpy
 
 ### 用法
 详见./demo.py
diff --git a/demo.py b/demo.py
index bbfd6c9..90c4084 100755
--- a/demo.py
+++ b/demo.py
@@ -26,7 +26,7 @@
 start = time.clock()
 captcha_text = decaptcha.decode(captcha_image)
 elapsed = (time.clock() - start)
-print("Time used:", elapsed)
+print('Time used: %f' % elapsed)
 print('captcha_text: %s' % captcha_text)
 
 
@@ -35,6 +35,6 @@
 start = time.clock()
 captcha_text = decaptcha_copy.decode(captcha_image)
 elapsed = (time.clock() - start)
-print("Time used:", elapsed)
+print('Time used: %f' % elapsed)
 print('captcha_text: %s' % captcha_text)
 captcha_image.show()
diff --git a/utils.py b/utils.py
index 226dc05..d45bb27 100644
--- a/utils.py
+++ b/utils.py
@@ -1,11 +1,17 @@
 #!/usr/bin/env python3
+import sys
 from PIL import Image
-from urllib.parse import urljoin
-from html.parser import HTMLParser
-from urllib.request import Request, urlopen, urlretrieve
 from io import BytesIO
 import re
 import logging
+if sys.version > '3':
+    from urllib.parse import urljoin
+    from html.parser import HTMLParser
+    from urllib.request import Request, urlopen
+else:
+    from urlparse import urljoin
+    from HTMLParser import HTMLParser
+    from urllib2 import Request, urlopen
 
 
 class _CaptchaParser(HTMLParser):