Abstract:The cutting experiment of Q235 carbon structural steel was carried out with the pre-mixed abrasive water jet, and the surface roughness of the sample cut was measured. The influence laws of the cutting pressure, nozzle outlet diameter, cutting target distance, cutting speed and cutting depth on the roughness of the sample cut surface were studied by the mixed abrasive water jet. Combined with experimental data, a second-order nonlinear regression prediction equation for surface roughness was established. The research results show that the cutting pressure of the pre-mixed abrasive water jet, the nozzle outlet diameter and the surface roughness are negatively correlated; the cutting target distance, cutting speed, cutting depth and surface roughness are positively correlated; the influence weight of each factor is in order: nozzle outlet diameter, cutting depth, cutting pressure, cutting speed, cutting target distance;the essential factors affecting surface roughness are abrasive flow and abrasive energy; the average deviation of the established surface roughness quadratic nonlinear regression prediction equation is 7.99%.