diff --git a/docs/apis/self.crawl.md b/docs/apis/self.crawl.md
index d8da32f01..9891e2ef6 100644
--- a/docs/apis/self.crawl.md
+++ b/docs/apis/self.crawl.md
@@ -113,7 +113,7 @@ class Handler(BaseHandler):
 > `Handler.crawl_config` can be used with `proxy` to set a proxy for whole project.
 
 * `etag` - use HTTP Etag mechanism to pass the process if the content of the page is not changed. _default: True_ <a name="etag" href="#etag">¶</a>
-* `last_modifed` - use HTTP Last-Modified header mechanism to pass the process if the content of the page is not changed. _default: True_ <a name="last_modifed" href="#last_modifed">¶</a>
+* `last_modified` - use HTTP Last-Modified header mechanism to pass the process if the content of the page is not changed. _default: True_ <a name="last_modified" href="#last_modified">¶</a>
 * `fetch_type` - set to `js` to enable JavaScript fetcher. _default: None_ <a name="fetch_type" href="#fetch_type">¶</a>
 * `js_script` - JavaScript run before or after page loaded, should been wrapped by a function like `function() { document.write("binux"); }`. <a name="js_script" href="#js_script">¶</a>
 
diff --git a/pyspider/fetcher/tornado_fetcher.py b/pyspider/fetcher/tornado_fetcher.py
index 4b60cceae..203cb9654 100644
--- a/pyspider/fetcher/tornado_fetcher.py
+++ b/pyspider/fetcher/tornado_fetcher.py
@@ -253,10 +253,11 @@ def pack_tornado_request_parameters(self, url, task):
             if _t and 'If-None-Match' not in fetch['headers']:
                 fetch['headers']['If-None-Match'] = _t
         # last modifed
-        if task_fetch.get('last_modified', True):
+        if task_fetch.get('last_modified', task_fetch.get('last_modifed', True)):
+            last_modified = task_fetch.get('last_modified', task_fetch.get('last_modifed', True))
             _t = None
-            if isinstance(task_fetch.get('last_modifed'), six.string_types):
-                _t = task_fetch.get('last_modifed')
+            if isinstance(last_modified, six.string_types):
+                _t = last_modified
             elif track_ok:
                 _t = track_headers.get('last-modified')
             if _t and 'If-Modified-Since' not in fetch['headers']:
diff --git a/pyspider/libs/base_handler.py b/pyspider/libs/base_handler.py
index ab39049ce..ae33ea2b0 100644
--- a/pyspider/libs/base_handler.py
+++ b/pyspider/libs/base_handler.py
@@ -273,6 +273,7 @@ def _crawl(self, url, **kwargs):
                 'proxy',
                 'etag',
                 'last_modifed',
+                'last_modified',
                 'save',
                 'js_run_at',
                 'js_script',
@@ -332,7 +333,7 @@ def crawl(self, url, **kwargs):
           cookies
           proxy
           etag
-          last_modifed
+          last_modified
           auto_recrawl
 
           fetch_type
diff --git a/tests/test_fetcher_processor.py b/tests/test_fetcher_processor.py
index ca73096fa..8b9cab612 100644
--- a/tests/test_fetcher_processor.py
+++ b/tests/test_fetcher_processor.py
@@ -276,8 +276,8 @@ def test_a160_etag(self):
         self.assertFalse(newtasks)
         self.assertFalse(result)
 
-    def test_a170_last_modifed(self):
-        status, newtasks, result = self.crawl(self.httpbin+'/cache', last_modifed='0', callback=self.json)
+    def test_a170_last_modified(self):
+        status, newtasks, result = self.crawl(self.httpbin+'/cache', last_modified='0', callback=self.json)
 
         self.assertStatusOk(status)
         self.assertFalse(newtasks)