i used to create blogs talking about the hottest google trends topics but the every blog contain 1 article or 2 ( 500 word + ) and i make good earning but i worry about 1 article in blog that might be against the rules
What the heck are you talking about, you make no sense. There's nothing against the rules about posting blogs or articles for adsense. The only thing you need to be careful for is duplicate content. You should only use fresh unique content on AdSense blogs, or risk getting dinged.
i write my own content i mean that i create a blog for one article and put adsense i ask does the blog must have more than 1 article to put adsense or what?
you cannot use adsense on under construction pages. One page is good to go, as long as you have an approved adsense account. Only getting a new account approved using an 1 blog site will be a bit of trouble..
why not just create one big blog and make sure to post unique content its better that way, and using google trends is very good way lots of people doing this right now trend blogging