Abstract: The hydraulic modle of refining LF argon blowing of Benxi Iron and steel Co.was simulated, the effects of optimization argon blowing method on mixing time of molten steel was studied at the same time.In addition, the influence of quantities of gas supply on mixing time of molten steel and inclusion was investigated.The results show that:the optimization argon blowing method can be gained besides the electrode collar area, which is the position of present ladle argon blowing.The mixing time of molten steel can be reduced obviously by adopting the optimization argon blowing method.In addition, the mixing effects of molten steel is the best when two permeable bricks work as 30° included angle and the position is simultaneously located in the 1/2 radius, besides, the included angle is 150° if the position is located in the 2/3 radius.Moreover, the mixing effects of permeable bricks lying 1/2 radius has obvious superiority compared with permeable bricks lying 2/3 radius under the same condition.The quantities of gas supply should be properly, too much amount of gas has no obvious effect on the mixing time, on the contrary, too much amount of gas can lead the slag into the molten steel.