Friends i have near 25 blogs and website. But visitor is very low in my sites how i increase them so that they click on google add so that i will earn money please help me

The only way to increase clicks to your ads is to increase traffic right? you can write original and interesting content to get more traffic, offer free stuffs, give product reviews and advertise your blog.

Promote your site by giving comment to other blog is one of many ways to get more visitors

Jabo has the right idea.

promote promote promote.. by the way theres alot post here regarding that one..

hire some wokers for your site..
If you alone try to improve the traffic , then reduce the no. of blog .

Adding nice , unique content .

Add some user interaction works to you site (for example ...Polls )