Abstract: Setting lifting particle traps in GIL is currently the most commonly used measure for common particle containment, which can effectively trap particles and restrict their movement. To achieve the best capture effect of particle trap, a finite element calculation method of particle trap capture energy efficiency under DC voltage is proposed in this paper. The effects of different structural parameters on the electric field distribution characteristics and capture efficiency of lifting particle trap were studied and analyzed. On this basis, the constraints of the optimization design of the lifting particle trap were proposed. Combined with the chaotic particle swarm optimization algorithm, COMSOL and MATLAB were used to optimize the structure of the particle trap. The results show that the larger the lifting height and thickness of the trap in a certain range is, and the smaller the width of the grid is, the better the shielding effect on the internal electric field will be. Increasing the thickness, lifting height, length and distribution angle of the trap and selecting the width ratio of the baffle to the grid in an appropriate range are helpful to improve the capture rate of the particle trap. After optimization, the capture rate of lifting particle trap can reach 74.16%, which is 53.36% higher than before. The reliability of the calculations is verified through particle capture tests with the scaling model. The results and optimization methods in this paper can effectively improve the capture effect of traps on particles, and provide technical support for the structural design of particle traps for DC GIL and GIS bus.