This is a normal phenomenon, most of the large current charging mobile phones have similar problems, in fact, the heat is not too much, just than the usual small current charging mobile phone is hot, don't worry.
It is recommended to solve the problem in the following ways:
1, avoid charging, while playing games, watching videos or making phone calls. 2, when using mobile phone for a long time, do not hold the phone close to your cheek, and try to use headphones or earphones. 3, turn off the phone is running redundant background programs, reduce the burden of the phone, thereby reducing heat. 4, turn off the mobile phone automatic download, automatic update and other functions to reduce unnecessary program update installation. 5, avoid the use of poor heat dissipation mobile phone protective case, or remove when hot, it is also best not to put on the phone case when charging. 6, the mobile phone in the hand or in the pocket will heat transfer, summer at home as far as possible in a ventilated heat dissipation place, go out as far as possible in the bag. 7, do not run a large mobile phone program for a long time, and try to stop using the phone during the charging process.