Abstract: The dephosphorization rate of converters was improved through optimizing the converter refining process and applying the method of multi-functional refining in converters on condition that any new equipment was not used. Based on the present converter condition, the temperature range of dephosphorization was obtained by thermodynamics calculation. The suitable time of slag tapping, alkalinity of slag, tapping temperature and the quantity of material were determined, and finally the optimal dephosphorization technique was confirmed. Comparing with normal refining, the quantity of material could be reduced and the dephosphorization rate was above 90% steadily by using the new technique. Besides, the quality of molten steel was improved and the cost of production was also decreased.