Lost Ranking on Google

I lost ranking for my all sites in August, All were going very fine and i was really satisfied with my seo team but with in one month i lost many primary keywords ranking on Google.

I am really worried what should i do to to get rank again

That's tough. Don't loose hope, just continue promoting your site and you will be back on the rankings.

Talk with your seo team about losing your rankings in search engines, I think they are using some black hat technique for website promotion.

Or probably you may have made a change to your site that the google doesn't like, continue building links and promoting your site you will some gain back your lost position.

I'm thinking of the duplicate content effect. Try to check your site for duplicate content.