Now a days blogging is vast marketing tips, so many people are creating blog and doing blogging. I also found that some blogger are copying content from other blog site. so my question is how to stop that type of blogger who are copying content from other blog site.

You can't stop these people from getting contents from other sites. Some are actually getting contents from other blogs that are updating everyday thru RSS feeds.

But, you can stop people from stealing content fom Rss feeds. Use a custom message in your rss feed, like a copyright message. This message could be at the bottom of your feed, here's one useful plugin and examples:

http://mwolk.com/blog/show-custom-me...-of-rss-feeds/

There's no way to stop plagiarists from stealing your blog content. The least thing you can do is disable the Right Click option on your blog to stop unnecessary copy of content.

Since you post things on web..that means you want to share the information..and copying is one of the possible things a reader can do