Hello aravfshadow144 and welcome to WebmasterWorld!
Netmeg is right, unfortunately there is no enough information in your post. In order for members to help you diagnose the problem, I am wondering if you could answer the following questions:
- when did your traffic drop (which date)
- The percentage of the drop
- was the traffic drop a slow slide losing the traffic over a period of time or an immediate drop to the lower traffic level?
- Have you checked your WMT Search Queries section, where I presume you could see the drop in impressions. Have you done any analysis of that data (which countries, was it long tail lost or big traffic keywords, etc)
- have you done any significant changes to your website prior to drop and if so, what did you change
- anything else that would help members help you diagnose your problem
referring some articles i got a point that duplicate descriptions and duplicate meta titles in WMT are also the main reason of manual penalty and sudden dropping ?
Duplicate titles and meta descriptions are not the reason of manual penalty, but they may signify a duplicate content issues with your site. However, unless you did some changes to your website before your drop, which introduced duplicate titles and descriptions, then I doubt this is the reason for traffic loss.
In other words, if you had duplicate titles/descriptions problem for some time before the traffic drop, they would not be the reason for your drop.
But if you changed something with your site recently, which resulted in duplicate titles and descriptions and then you saw the drop, then you probably have some techincal issue where duplicate titles and descriptions are just manifestation of the same problem and whilst they are not the reason for your drop, they may point to an issue with the site.
I suggest that you try to answer questions I listed above so that we get more information first.
