Abstract: The article describes a new technology dealing with complex refractory ores-depth reduction technology,and summarizes the application research status of depth reduction technology in the processing of Oolitic,Bayan Obo oxide and nickel laterite ore several recognized complex refractory ores,and points out the development direction of the process.By analysis and comparison with other methods obtains that the depth reduction technology shows its superiority in development and utilization process of China's complex refractory ore,and opens up a new way for the processing of complex refractory ore.