It is urgent to look for a clean acid-free descaling process in rolling field because acid cleaning is unable to meet the needs of environmental protection. This article describes a descaling technology with abrasive water jet， which has been verified by experimental data on the descaling effect. The experiment results showed that the scaly skin removal efficiency of abrasive water jet technology can reach more than 98%. The main test parameters and the best descaling process parameter range is given. A acid-free descaling process and a full range of equipment of the process was designed on the test basis. These process and equipments have been applied to the actual production. Good application results have been achieved on nickel plate and stainless steel plate.