I would question anything that this Battery Doctor app is telling you. I note that that app makes some impossible claims. For example, it claims to be able to look for "junk files," yet the sandobxing in iOS means that it can't look at any files other than its own and specific documents that you explicitly share with it. That's a bogus claim.
Go to the Settings app and navigate to General -> Usage. A list of apps will appear under Storage... scroll down and tap Show All Apps at the bottom of the list, if it appears there. Do you see this Chinese app in that list? If so, what is its exact name?
The fact is, if your phone has not been jailbroken, it's not possible for there to be a hidden application on it. If you think it may have been jailbroken by someone else with access to the device, then you should restore it to factory settings:
http://support.apple.com/kb/ht1414