Bringing GF to China

I am currently trying to get everything togethere to bring my Girlfriend that I have been seeing for over a year here to China with me after CNY. i am a American that lives here most of the year for work. She does not work. I really don't want to use an agency, but if have to will. Any recommendations for what I will need to make this process easier, looking to get minumum 6 months multiple entrie visa.

Best Regards