Your address only needs to be in Chinese, and in English you only need to write: P.R.China (People's Republic of China). Foreign express companies only need to send the mail to China, and the Chinese will handle the rest, so it doesn't matter how correct your English expression is.
So, just write it like this:
No. 6, Unit 2, North Building, No. 3 Cisheng Street, Wen County, Jiaozuo City, Henan Province
P.R.China