Based on the molten iron furnace ins plashing intensity is infrared sens ide. is detecte forecasted or, temperature difference between the of liquid slag surface and d to characterize the metal oxide content in the liquid-slag. The according to the interval of the temperature difference, correspondingly, the top-gun position, pressure splashing dose and proportion, argon-oxygen mixture flowing rate, carbon-oxygen reaction speed and metal oxide content in the slag are adjusted to prevent the splashing.