Abstract: According to the characteristics of steelmaking with semi-steel at PZH Steel,the structure and spray nozzle of oxygen lance for high supply intensity were discussed.The new type oxygen lance has 5 jets,and the jets are arranged on the same circumference of spray nozzle end.The shape of jet is similar to Laval-shape,and the dip angles are 13° and 15° respectively.The throat diameter is 35 mm.The metallurgical effects of new designed oxygen lance were obvious.It shortened oxygen blowing time 2.6 min/heat,meanwhile,the blowing process was smooth,the need of lining protection by slag splashing was satisfied,and the technical-and-economic indexes were improved.