i have 1 blog in blogspot(1 year old) this blog have 500 pages but only 100 indexed, what should i done?
Try to create links whenever possible between all your pages in your blog. That will help the spiders to crawl better.
Google will not index 100% of your pages. Depending on your site. It is normal to have 10% to 50% indexed. Even sites such as wikipedia do not get 100% indexed.