walk cycle

How can I make my walk cycle more realistic?Does some people know how to make my animation smoother?
Because my current animation looks a bit shaky.

Attachments

animation.blend (541 KB)

Did you have a look at the walk cycle tutorial on the wiki? Here’s a link:
http://wiki.blender.org/index.php/Doc:Tutorials/Animation/BSoD/Character_Animation

There is a link to the walk cycle page in the Animation section.