More than 80 pages of my blog are cached but my blog could not get PR is there special work to do for blog help kindly guide me
The PR of your site does not rise just by having lots of pages. PR is representative of how much exposure your site has across the world wide web. Even if you have lots of pages, if no one is seeing them, your PR will not be high. And no one will see your pages if you're not getting backlinks to your blog. In my experience, the key to ranking with any site is not just posting content, but getting quality backlinks. First, have you used "keyword optimized" titles for your blog posts? Is this a free blog or a wordpress blog that you're hosting? If you have a wordpress blog, I recommend the All-In-One-SEO plugin. But really, the key to ranking your blog is to get other sites linking to your blog, with your keyword in the anchor text. Example: <a href="yoursite">your keyword</a> The more of those you have from other websites, the higher you will rank for that keyword.
Get some sites linking in, try to go for credible sources and you will see a shift. You got to earn that juice
PR is should be given to single page. You told that you have 80 pages indexed it not like you get PR main site link. The PR may vary to each and every page of your 80 pages. The PR of page depends on how quality information is providing that page and how many backlinks exist for that particular page from other high ranking PR pages. there lot of factors to be considered for getting the PR.
If you would like to get google page rank(PR) then you should try to get some quality links to your blog. This will increase your blog quality and reliability at search engine. Your will get pr in next google updation if you are able to get good quality links.
Well first thing congrads on having the pages cached. Seriously nice to see your hard work go rewarded. As noted PR is all about backlinks. Try to find backlinks from site that do not have to many on the page but most importantly make sure the links are do follow. You can have a backlink from a very high PR page but if its nofollow its won't help your PR quest.