By using both physical simulation and numerical simulation, the effect of flow behavior on the inclusion removal rate in a 200 t ladle in Pan Steels under certain argon blowing flow rate and blowing time was examined. The results show that the inclusion removal rate is affected by floating bubbles, vortex flow and free surface velocity in the ladle. In the argon flow rate range of 4~5 Nm3/h, the increase of the flow rate causes the decrease of inclusion removal rate. However, in the flow rate range of 5~12 Nm3/h, the increase of the flow rate promotes to increase the inclusion removal rate since the stirring energy is strengthened. Once the flow rate exceeds 12 Nm3/h, the inclusion removal rate drops again because the flow pattern in the ladle is affected by the back flow and vortex flow pattern. So the optimum argon flow rate range for the ladle is 9~12 Nm3/h, and the ideal blowing time 8~10 min. With the optimum blowing flow rate and blowing time, the total oxygen content in final steel can be controlled below 25′10-6(w).