In view of the high mud content of oxidized copper ore in some copper mine,the types and mineral components of the oxidized copper ore with high mud content were analyzed.The acid leaching experiment was made on three kinds of ore samples with different grade sizes(-0.295,0.295 ～ 1,-1 mm).The experimental results showed that the ore with grade size of 0.295 ～ 1 mm can be processed using vat leaching technology,of which permeability and leachability are good,the leaching rate of copper is 70.27%,the leaching rate of iron is 2.22%,average acid consumption is 10.06t /t Cu.