My iPhone 4s usage Wi-Fi when connected to the charger?

It's downloading a hauge amount of data and you can't see what is that data from Wi-Fi
-that happened only when i connected to the charger and will stop it immediately when disconnected from the charger
-iClould is off (noting work)
-itunes automatic download and updates are all off
-the phone is NOT jailbroken

It's probably an iCloud backup. That only happens when the device is on Wi-Fi and connected to a charger. My iPad does that all the time

I have turned off and deleted everything belong to iCloud, so the problem is not iCloud for sure.

Try to factory reset…