my site keywords drop down even i dont used any duplicate content or the spam then what would be the error is there is any hidden update by the google please help me out what the problem behind it

Well, here I would say this might be the case of Google dance, try waiting a while to see if there is any more fluctuation.

Some of the keywords more up and down in the search results known as keywords fluctuation.Just wait for some time in order to get the entire results.

Yeah. Wait and watch. Also check your back links weather it is ponted to your site and hurt your site? If you fell that, disavow them by webmaster tool.

thanks you all mates for your kind supports