Wife beating in China is a question that is only talked about behind doors has it is consider a private affair and not one of the state until lately.
http://www.chinadaily.com.cn/en/doc/2003-08/22/content_257504.htm
Setting up a system would admit there is a problem with society. No, matter how many great things China has done in the last couple of years they still have trouble then it comes to admitting that things may not be as rosy as they should be.
Also there is a unspoken tradition in families that admitting such a thing would be a failure of the marriage and in most cases the girl would be blamed, so in the end the girl keep quite.
As of yet China anti-wife beating programs are not as good as other counties in the world ie no shelters, aid or like-wise many women simply keep quite about it because they do not have the money or place to go to.
As for your second part of your question, its totally misleading, here asking why the people of that time did it.
Edit:
I did not deny there exit husband beating wife. The difference in china and US or UK, where you are from, is this: widespread or pervasiveness. Weak culture and agression is the key indicator.
You are not making sense here, can you rephrase.
As for key indicators you are half right its aggression but not a "weak culture", you should change "weak culture" with sociality's attitudes towards women.