Abstract: The present situation of ore loss and dilution in mining process in Shizishan copper mine were introduced.Aiming at the difficulty in control of ore loss and dilution of complex ore body in mining process，studies were made from the improvement and optimization of mining method for mining technology to put forward the concept of “selecting mining method based on the ore body condition”，and the short hole shrinkage method with pillar and the sublevel caving method with pillar and vibrating ore-draw were chosen as the reasonable mining methods and their corresponding structure parameters were adjusted as well.With the improved process (phase forced caving mining process)，the average loss rate and the average dilution rate reached 7.56% and 17.01% respectively.Compared with the original mining method，the loss rate was reduced by 5.8% and the dilution rate was reduced by 8.09%.It has achieved good effect in field application and improves economic efficiency of mining enterprises.

Key words: Loss, Dilution, Mining Method, Optimization