Some one is copy my website's content on his blog ?

[Richard]

There are more advanced ways to protect against scraping and copying, but none of them are entirely foolproof. You should expect that the more popular and visible your site gets, the more often you'll find your content scraped and re-published. Many times, you can ignore this problem, but if it gets very severe, and you find the scrapers taking away your rankings and traffic, you may consider using a legal process called a DMCA takedown.

Check out: Four Ways to Enforce Your Copyright: What to Do When Your Online Content Is Being Stolen