Nozzle is the crucial component used to generate high pressure water jet, and its structure form has large influence on dynamic performance of high pressure water jet. So the influence of nozzle structure on high pressure water jet was analyzed, and the optimization design of nozzle structure parameter was implemented. A two-phase flow computational fluid dynamics model was employed to analyze the flow field. 〖HJ*2〗The Kriging surrogate model was used to replace the computational fluid dynamics model in the process of optimization design for reducing the computational resources. The nondominated sorting genetic algorithm and multiobjective evolutionary algorithms based on decomposition were respectively employed to carry out single and multi objective optimization design. The research results show that the general capability of lineform nozzle is the best, the concavity-form nozzle is in the middle, and the protrudingform nozzle has the worst capability. The single and multi objective optimization design of lineform nozzle is implemented, in which the core zone length and the mass flux of water jet are taken as optimization objectives. Compared with the baseline, the two indexes increased by 14.71% and 27.56% respectively after the single objective optimization. The optimal semi-cone angle after multi objective optimization located on ［15.4°， 89.8 °］. The global optimization algorithm based on surrogate model and evolutionary algorithm is proved to be effective.