In the design of underwater transducer, the structure dimensions, electroacoustic characteristics and other constraints need to be considered, so it is very important for designers to quickly find out the optimal design scheme. This article presents a design method for parameter optimization of underwater transducer. Firstly, the parametric model of the transducer is established by using the ANSYS software APDL parametric design language. Then the parametric model of the transducer is imported into ANSYS Workbench platform, the optimization constraints and optimization objectives are given by setting the input and output variables, and the program automatically performs the optimization calculation and gives the optimal design results after selecting the appropriate optimization algorithm. This method can solve the optimal solution within the range of transducer parameters, and can also greatly improve the optimization efficiency of designers.