Abstract: In order to improve the surface quality of metal cutting by abrasive water jet, a cryogenic assisted abrasive water jet cutting method was proposed.Liquid nitrogen is used to assist in cooling the target to-196 ℃, and then pre-mixed abrasive water jet is used for cutting.304 austenitic stainless steel and 430 ferrite stainless steel were selected as the target materials, and the mixing level tests were carried out on the three factors of jet target, temperature and nozzle pressure by using the mixing level orthogonal table, and the roughness Ra was taken as the experimental index.The experimental results show that the primary and secondary order of factors affecting the temperature, the material, the pressure, it is concluded that optimal solution for the temperature to-168 ℃, 304 stainless steel material selection, the pressure is 35 MPa, cryogenic aided greatly improve the quality of the surface of the abrasive water jet cutting metal, this article for further analysis of low temperature auxiliary to the influence of the mixing mechanism of abrasive water jet cutting metal before laid a certain test base.