China Resident Permission

Hi, I am doing RMG business in Bangladesh and my business 70% related with China to buy Raw materials of RMG Business. Every year around 4 months of a minimam period I have to stay in China to follow up my business work. I have enter more then 10 times in China since last 2 Years for this.So could you pls advise may I apply resident permission in China to stay long time without issue visa again n again.
Thanks in advance.
Brgds
Akram.