The pseudospark switch is widely used in the field of repetitive pulse power technology due to its advantages of high withstand voltage, large current and low jitter. With the development of laser technology, laser triggered pseudospark switch (BLT) has become a current research hotspot, which is very beneficial to solve the complex problems of electrical isolation, anti-interference and synchronization in large pulsed power devices. Because the high energy density focused laser is often used in BLT, it is of great research value to explore the damage characteristics of switch under different factors and obtain the optimal trigger mode. In this paper, the simulation model of laser ablation of metal based on the simplified two temperature model is constructed, and the influence of laser energy and metal type on the shape of ablation pit and the influence factors of electrode life are explored. The simulation results show that with the increase of laser energy, the depth and radius of the ablation pit increase, and basically meet the linear relationship. When the same laser irradiates different kinds of metals, the depth and radius of the ablation pit are quite different. The metal with low absorption rate, high density and high evaporation latent heat has shallower ablation depth, and the service life of the corresponding switch is longer.