Abstract: This paper addresses the optimization problem of the jetting sword of an underwater vehicle for submarine cable burying operations and proposes a parameter optimization method for the jetting sword based on computational fluid dynamics (CFD) and orthogonal experimental design. Computational fluid dynamics software is used to construct the geometric model and mesh model of the jetting sword, simulation software is used to perform the jet flow simulation of the jetting sword, and post-processing software is used to visualize the jetting effect of the jetting sword. To address the issue of numerous parameter levels in the jetting sword optimization process, the influences of the number of nozzles, nozzle diameter, inclination angle, and nozzle shape on the jetting effect are comprehensively considered, and a parameter optimization method for the jetting sword based on orthogonal experimental design is proposed. The jetting performance of the jetting sword is analyzed by comprehensively considering velocity, pressure, and jet action area, and the optimal structural parameter combination of the jetting sword is obtained.