Hello friends,

How to block spam commenting in my word-press blog?

Follow some simple step:
1. Login your WordPress blog.
2. Go setting.
3. Go Discussion in Setting.
after that discussion window open and read all instruction clearly
4. Go Email me Whenever in Discussion
     Two Check Boxes here
   a. Anyone posts a comment .
   b. A comment is held for moderation
So checked option b

So anyone post the comment to your blog firstly comment held for moderation, read comment and you can approve or not that comment.

Install Anti-Spam Plugins:There are thousands of anti-spam plugins but you don't want them all. Most will slow down your blog and as a matter of fact, I tried over 50 variations of spam plugins; some caused error and some did not work. However, after lots of testing, I found 3 plugins that work; simply install them and you should be fine.
Banning the Spammer's IP Address:If you come across any IPs that you believe is a spam bot then you can block it from accessing your blog. It is quite simple. You can blog an individual IP or a range to prevent wordpress spam.

you should add the google captcha for stop spamming