The Double-Temperature Equation(DTE)was simulated with the finite difference method,which was formatted simply. The effect of the pulse shape on the ablation results had been studied when the femtosecond laser was irradiated on the copper surface. The simulation results show that if the laser pulse energy is not changed,the effect of the laser shape will be ignored. And if there are several laser pulses irradiated on the material,the thermal incubation effect would occur only when the repetition rate is in a scale(which is changed with the character of the materials). For the materials that have good conductivity,such as metals,the thermal incubation effect is not clear. Experiments show the same results.