Chinese troops in the Imjin War

The Chinese soldiers certainly commited atrocities in Korea. But probably not on a particularly large scale. Many historians completely overexagerate.

i think that one's an exageration..

Japanese troops were much greater in number and they went to more places than Ming troops..

I agree.  Anything is possible.  Whenever a foreign army enters a country (whether it is an ally or enemy) you are always going to have rapes and pillaging.  It is also true that the Ming army was poorly trained and fed (Emperor Wanli was one of the worst Emperors in Chinese History, made worse because they really needed somebody of ability at that critical time, like Yongle), but I understand that the Northern Armies was the cream of the crop.  However, just because they are highly trained and paid for does not mean that they will not commit crimes.  Look what happen during the crusades.  There was rape and pillaging by the European knights too (one on the many reasons why the crusades was doom from the beginning).

It is also entirely possible that the Ming Army destruction of Korea was as great as the Japanese, but I tend to think it was not as bad (still terrible).  Due solely to the assumption that the Korean goverment must have logged complaints the the Ming court/army about their criminal activities, thus prompting the Ming Armies to at least make a half hearted attempt to stop the pillaging.  It is a little hard for me to think the Ming Generals would have a deaf ear to their Korean counterpart's complaint, and it is a little hard for me to think that the Korean Government and Generals would just accept it.  However, I may be wrong.  But regardless, it is wrong for any army to enter a foreign country and commit these kind of crimes.