Greetings,
My wifes hukou is from Yang bi, and last year i got my visa from Dali. Now the question is in order to avoid long trips, is it possible to re-new my visa in Kunming and what supporting documents will I need ?

My wife is from Kunming so her hukou is from here. I don't know what the rules are if your wife is from a different place. The things you need to renew your visa are in this post. I'll be picking up my new visa on Friday. :-).

Here are what you need:
www.gokunming.com/[...]

PSB will have a list, but from memory we needed photocopies of Wife's original id and temporary (Kunming) ID . Along with the usual docs

It depends on what your visa is. If as it seems from your post that your visa is a residence permit type because of marriage, then AFAIK you are obliged to register in the capital of the prefecture for which you have a current PSB residence registration.

So if you have a PSB registration in Kunming, you can do it in Kunming. If you have a PSB registration in Xiaguan, Dali or Xuzhou, you would do it in Xiaguan. If you have no PSB registration at all, just use your latest hotel registration.

Also required are identification documentation and original marriage certificate (including foreign notarization and foreign country's Chinese consulate re-notarization if married overseas).