Hello Yile Zhang,
Thanks for reaching out to Microsoft Community. I'm sorry to hear about this issue on your device. I understand how concerning it is to have such problem.
I'd like to inform you that Surface Pro 7 with i3 and i5 processors models are fanless and only reliant with passive cooling. Surface Pro 7 with i7 processor has fan and active cooling though.
If your device is experiencing sudden blue screen error, I'd suggest following the methods on Troubleshoot blue screen errors - Microsoft Support.
I hope this helps. Otherwise, don't hesitate to respond to this thread if there’s anything else that needs to be addressed.