suitable visa for my wife

Hello Everybody!!

I am working in china on Work Z for last 4 years. Now I wish to bring my wife here in China. So I should apply for which type for her?

Somebody told me to bring her on L type and then extend the same 2 times. ( 1 month each time). Possible?

Also let me know any other type useful to her so she can stay here longer.

Thanks and Regards,

Mohan.