The technical characteristics of multi-functional refining in converter (MURC) were studied, an new MURC smelting process under low hot metal ratio to meet the actual production conditions in Fujian Sansteel Minguang Co., Ltd. was developed. The results show that promoting the melting of lime during dephosphorization period is the key step for new MURC process. Adjusting the charging amount of lime according to the Si content in hot metal is helpful to controlling the melting of lime and slag basicity. Under the condition of low hot metal ratio, in order to catch the kinetic requirements of smelting reaction in dephosphorization period, higher smelting temperature in 1330~1360℃ should be required, and the target slag basicity and total Fe content in slag should be lower compared with conventional process. The industrial tests of new MURC process show that average tapping C content of smelted steel is 0.183%, and average tapping P content 0.0183%, and average dephosphorization rate more than 90%. At the same time, compared with conventional process, the new MURC process saves the consumption of steel material about 2.3 kg/t and consumption of lime 11.2 kg/t averagely.