diff --git a/lib/qiniu/rs.rb b/lib/qiniu/rs.rb
index 0c0f457..d15216f 100755
--- a/lib/qiniu/rs.rb
+++ b/lib/qiniu/rs.rb
@@ -195,10 +195,6 @@ module Qiniu
         code == StatusOK ? data : false
       end
 
-      def image_preview_url(url, spec)
-        Image.preivew_url(url, spec)
-      end
-
       def image_mogrify_preview_url(source_image_url, options)
         Image.mogrify_preview_url(source_image_url, options)
       end
diff --git a/lib/qiniu/rs/image.rb b/lib/qiniu/rs/image.rb
index 78e128e..9dbdf7c 100755
--- a/lib/qiniu/rs/image.rb
+++ b/lib/qiniu/rs/image.rb
@@ -14,10 +14,6 @@ module Qiniu
           Utils.http_request url + '?exif', nil, {:method => :get}
         end # exif
 
-        def preivew_url(url, spec)
-          url + '/imagePreview/' + spec.to_s
-        end
-
         def mogrify_preview_url(source_image_url, options)
           source_image_url + '?' + generate_mogrify_params_string(options)
         end