Under the irradiation of repetitive pulsed lasers with different duty ratios, the temperature increase characteristic of front and back surfaces and the variation law of ablation depth are numerically simulated, and the influences of material thickness and variety are investigated. The simulation results show that the temperature increase curve for the front surface possesses a tooth-like shape. The smaller the laser duty ratio or the thinner the material is, the higher the back surface temperature is, and the deeper the ablation depth is. Compared with the continuous-wave laser, the repetitive pulsed laser is more beneficial to heating and ablation of metals.