As an important facility for offshore oil and gas exploitation, the safety of offshore platforms has attracted much attention in recent years. PSO (particle swarm optimization algorithm) was used to optimize the tilt ratio of the pile legs of the jacket, and the static and dynamic analysis of the pile-based offshore platform structure was carried out by using offshore software, and the optimal leg tilt ratio was obtained through the displacement response of the offshore jacket platform, the force analysis of the pile head point and the comparison of the UC value of the jacket members. At the same time, the influence of pile group and single pile on the ultimate bearing capacity of the jacket was analyzed, and finally the structural optimization design scheme of the jacket was given, which provides data support for the structural optimization design of pile-based offshore platform.