The background of the development of the BRP technology(Baosteel BOF Refining Process) is presented along with the experimentalconditions and results. The relations between dephosphorizationand basicity of slag, bottom blowing, temperature at endpoint are analyzed. The effects on dephosphorization of bottom blowing,total iron of slag and silicon content in hot metal are also considered.The performance results indicate that, in the de-P converterand the de-C converter respectively, the dephosphorization efficiencyis over 84% and 64% with phosphorus contents below 0.014%and 0.005%. Steels that are difficult to elaborate, such as tire cordedor X 65 pipeline steel with HIC-resistance benefit from the BRP technologyin Baosteel.