Abstract: In order to optimize the high pressure roller mill process of large copper concentrators and reduce investment and operating costs，aiming at the selection of different configuration schemes of high‐ pressure roller mill process in the beneficiation process of large copper mines，a comparative study of typical three-stage two-closed-circuit and four-stage two-closed-circuit high pressure roller mill process schemes is carried out in a large copper mine in Pakistan.The research results show that compared with the four-stage two-closed-circuit process，the construction investment of the three-stage two-closed-circuit process is re‐ duced by 69.7619 million yuan，the unit ore operation cost is reduced by 0.79 yuan/t，and the present value of the cost is reduced by 184.4742 million yuan.At the same time，the three-stage two-closed-circuit pro‐ cess has the significant advantages of lower operating cost，higher system adaptability and reliability due to the small number of equipment and small building scale. Under the premise of meeting the requirements of ore treatment，the three-stage two-closed-circuit high pressure roller mill process scheme has better econo‐ my and operability.

Key words: copper ores, high pressure roller mill, three-stage two-closed-circuit, four-stage two?closed-circuit, economy