Abstract: The effect of mixed jet intensification on the surface residual stress field of 18 CrNiMo7-6 carburized steel was investigated. A prediction model for process parameters and surface residual stress field was developed. Firstly, a new characterization form of surface residual stress field was proposed based on characteristic parameters and cosine function,including surface residual stress, maximum residual stress, maximum residual stress layer depth and residual stress layer depth.A Box-Behnken Design（BBD） experimental framework was employed to analyze the effects of three process parameters（shot diameter, peening pressure, and moving velocity） on the four characteristic parameters. Using numerical fitting via Design-Expert software, regression equations for the characteristic parameters were derived, enabling the prediction of the surface residual stress field. Experimental results show that the coefficient of determination between predicted and experimental values exceeds 0.95, with the mean relative errors consistently remaining below 10%, thereby verifying the accuracy of the predictive model.