My google webmaster shows 850 page indexed out of 980 pages submitted through sitemap. But site:www.articles2u.com in goole shows only 660 pages. it reduce daily.. Please help me solve this problem
Hum.. what do you mean? Looks like the case here is possible non unique content thus the indexed pages are reduced.
If your getting hundreds of submissions all of a sudden and publishing them, it looks like you have been added to somebodys software submission list. in which case you will be getting tons of duplicate submissions, which in google's eyes are not worth displaying in their index
pages submitted through sitemap and indexed pages are different. I think you should improve the quality of web content.
Google puts some of the pages in supplemental results. That means the site: search operator will not show them. Your pages may also be getting de-indexed because of a heavy duplicate content penalty.
Why you think my blog has duplicate content? Today start to increase my index - now 700 pages indexed.
Just wait it about data center and google updating http://digpagerank.com/index.php?url=www.articles2u.com+&dc=18
I wouldn't worry too much, people get too concerned about not having all their pages indexed but the truth is that I don't know of any site that gets all pages indexed. If visitors aren't coming through to you from the 800 or so other pages that google has indexed then either you need to consider whether your site is offering content that your visitors want or give up and start again. I'm sure your site is fine.