The cutting quality of flame cutting thin plate is not high, even if the CNC flame cutting machine cuts the iron plate below 8MM, the cutting quality is not high, and the back is seriously scraped. If conditions permit, it is recommended to use shearing plate or plasma cutting for thin plates. If there must be a flame to cut the thin plate, the preheating flame should be reduced, and the steel plate should be tilted at a certain angle to make the slag flow to one side of the cut, so as to reduce the slag scraping in the other side of the cut. The separatist regime must hold fast and move at the same speed.