I have tried once but they have not given me any specific reason please show me way to be approved for adsense.
No one will be able to give you suggestions unless you share the link to your blog. Be sure you have carefully read the program policies and Google webmaster guidelines: https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=48182
Maybe your site is violating any TOS for google adsense program. Please read their policy at first then apply.
Posting a link to your site would be of help. They've been getting more picky with who they let in, if you've got a blog make sure that it's not on an immoral topic and that it's got some age and you have more than just a few posts of content.
As far as I've been able to determine, that is false. Here is a discussion about the technical issue that caused people to think blogspot blogs were not allowed: http://groups.google.com/group/adsense-help-basics/browse_thread/thread/9d2c74ac7c079b69 Google is also more picky about quality than it used to be. And you have to have an established blog, not just a couple of posts.
I had the same problem with a new blog, just give it a little time and work then sign up again, Google focus more on quality now as Nonny said
Facing the same problem here. My Blog is not in anycase violating the terms and conditions. Please have a glance at winandmac.blogspot.com .........