My site is affected by google penguin, traffic on my site down, missing keywords on search engines. Please help me get rid of this algorithm
In order to "get rid" of it you have to understand what algorithm hit you and why. Take a look at some algorithm changes here. You should make use of the Google and Bing Webmastertools and look for hints, warnings and errors.
If it is really related to your content (quality and quantity, uniqueness, authority, usefullness ...) or your backlink profile, you can try to change it to the better.
Please take a look at this question and answers on the same or similar topic.
I provided these links:
Considering that Penguin is supposed to repair the effects of improper ranking due to obscure techniques, we can assume that the algorithm thinks that you have done something wrong.
If you have used any tactic considered 'black-hat', then you can start by undoing that. If you haven't then you should read the links provided by initall and also check the links provided in this wikipedia article.
Penguin is all about web spamming. In my view first you should remove your spam links. If spma links like article and directory van not be removed, then you can directly remove it by a tool of Google in Google webmaster i.e. https://www.google.com/webmasters/tools/disavow-links-main