Abstract: A water model of 1:2 scale was established to simulate the bottom blowing of N₂ in a 3 t ferrovanadium electric arc furnace(EAF). The L₂₅(5⁶) orthogonal matrix was adopted to investigate the influence of different blowing positions and nitrogen blowing rates on the mixing time of liquid. Results show that the optimal bottom blowing conditions are as the following:the flow rate of bottom blowing is 1306 L/h and the positions of porous plugs are e(0.7R),d(0.6R),and e(0.7R) in the model. Both the position of porous plugs and the gas flow rate have significance on mixing time. The mixing time fitting result indicates that there is an exponential relationship between mixing time and gas flow rate,and the index value is- 0.5211.