According to characters of the ore body in Xincheng Gold Mine,which is massive,broken,inclined and difficult to mine,the reasons of ore loss and dilution in the mining are discussed.The filling system and filling technology analyzed.Optimize strategies are proposed followings:Optimizing filling system and reasonably laying out network of filling pipe;making experimentation of filling material and introducing new cementing filling material to improve filling strength;strengthening the quality responsibility of filling station to meet the filling ratio requirement;carrying out construction in accordance with the design to strictly prohibit the height and width exceed of mining roadway;using a variety of technical measures to ensure roof-contacted filling;increasing the concentration of filling slurry.The practice has proved that the optimization measures can reduce the contact and mix of fine ore with filling,ore recovery rate has be improved from 92% to 94.5%,and ore dilution has be reduced,resulting in obvious benefits.