Why my phone turn to blue screen?

The temperature gets higher than the screen turns to blue?

I don't understand you, i'm sorry.

But alright, what I think you're saying is that the temperature gets higher and the screen turns to blue (apparently).

Note, a Blue Screen Of Death is not the same as an overheating phone.

Try using a force reboot first, maybe that'll help, also make sure not to put too much load on the CPU, GPU or RAM as this WILL heat up your phone