Abstract: In this paper,the oxy-combustion melting furnace developed by a company had been taken as the research object.Based on the VOF multi-phase flow model and the Realizable k-ε model,the gas-liquid two-phase flow in the molten pool area of the melting furnace had been numerically simulated.Under the standard conditions,the effects of different oxygen immersion depth,oxygen gun diameter and oxygen gun tilt angle on the melting performance of the melting furnace had been investigated by means of single factor variables,matrix analysis and weight calculation,in order to achieve the goal of optimizing the molten pool smelting performance.The average velocity of the molten pool,the average turbulent kinetic energy of the molten pool and the melt gas content are selected as the relevant indexes for judging the melting performance of the molten pool area.According to the experimental results,the optimal structural parameters of the oxygen lance are as follows:oxygen immersion depth 70 mm,oxygen gun diameter 22 mm,oxygen gun tilt angle 22°.The influence degree of each parameter on the smelting performance of the melting furnace is in following order:oxygen lance diameter ＞ Oxygen gun tilt angle ＞ Oxygen gun immersion depth.After optimizing melting furnace condition the average stirring speed is increased by 9.13%,the average turbulent energy of the molten pool is increased by 7.43%,and the molten pool gas content is increased by 8.32%.