I checked my google webmaster tools today and found my indexed urls dropped from more thant 6th to only about 1th.Who can tell me the reason?Thanks!
Is that a new site? If thats, give it some time to get indexed again. It happened with one of my new blogs and got back in index after a couple of weeks.
Things only seem to stabilise with new sites after a few months and sometimes after a year. Backlinks and indexed URLs reported by Google Webmasters can go up and down fairly regularly.