Since April 1st, may be april fool day effect, my site crawled by google with duplicate page. My page crawled and indexed by google several times. So my litter site that only contain 300 pages can indexed untill 2600 pages. Most off them SR. Please tell my why
I'm not sure I fully understood you. If Google finds the same page on your site by using multiple URLs (this is common with dynamic, database driven sites) it will pick one version for the index and put the rest in supplimental results. You said that you have pages that are being indexed many times, if it is with the same URL, I believe this is a Google error. A couple of my sites are showing that with static pages, although not nearly as extreame as you are describing. When I use the Google webmaster tools I have several static pages that are duplicated once. I would imagine Google will get this worked out without any repercusions for the site.
if you have duplicate content, its because it can be accessed more than one way... for example: http://forums.digitalpoint.com/showthread.php?t=297670 http://forums.digitalpoint.com/showthread.php?p=2813014 which vBulletin is riddled with. SR results will most likely be removed in the future. they move to SR when google can't access them for some reason, and it goes to SR to 'wait' and see if it can crawl it again. if not, it throws it in the trash and un indexes it
My site that indexed by my sitemap only about 300 pages (and since it's builded until March 31st still 300 pages indexed) but at April 1st morning indexed 900 pages, at noon 1500 pages and now indexed 2600 pages.