any sugguet ppa for 1204lts??

https://launchpad.net/ubuntu/+ppas?name_filter=puppet

All you have to do is search. Launchpad has a PPA search facility

Obviously change the filter on each PPA page to see if it supports Precise as well as the package versions for Precise

already search and come here.
i check most of the search result ppa are not maintain actived. so i feel confused.

feel sorry, and thank you for picking a best one.

Click each link in turn. Where the filter drop down is, use your mouse to select 'precise' as that is the codename of Ubuntu 12.04. Click the filter button next to it and you are now looking at the packages for Precise on the PPA you are looking at. If you don't see the package you want at a version you want then return to the big list and hit the next one.

How is that confusing? Or did you just see a lot of text and panux?

I suggest you use a new tab for each PPA

 not good one ppa still now.

see here for good choose.
http://docs.puppetlabs.com/guides/puppetlabs_package_repositories.html#for-debian-and-ubuntu

sorry,
for this one: https://apt.puppetlabs.com/puppetlabs-release-precise.deb