Niche Blogging : This means that Your blog must be having content related to only one thing that means if I am having a site realated to smart phone reviews then I must write post about them only not anything else because this trick is going to give your site rank and also going to increase chances for adsense Approval.
Regular : On blogger you must write post regularly this will give a good impression on users of your site and this is very important to get adsense approval as they approve those bloggers who are really serious about adsense.
Fast and secure :This one is not followed by most of bloggers , they though that design is everything but in reality their content , spped of opening and closing of your site and user privacy is more important to adsense than design.
Education or /Medical :If you are not getting adsense approval then I am having a trick that you must follow to get adsense approval very very easily , what you need to do is that you have to create a blog related to education or mediacal because adsense support websites replated to these topics so this one is best trick for adsense approval.