Result:
Boom ,The strip blow up, and i made a black mark on the floor,the air switch of the outlet was pop ,half of the PCB turn to black .
fortunatly, i didnt hurt myself.
what cause it:
the L and N on my PCB are too close, and when the power line being pulled and drag back incidentally,the wire loose,and a piece of wire cross through the L N .
i really learn a lesson from it.
(the floor and PCB have been cleaned,the mark still is on the floor)