In order to understand the mechanism of metal ablation by ultrashort pulsed laser,especially the effect of electron emission from the target surface during ablation,the mechanism of the interaction between femtosecond pulse laser and metal material is theoretically analyzed in this paper,and based on this,an one-dimensional two-temperature model is established.In the model,many parameters changing with temperature are taken into account,such as thermal conductivity,heat capacity,electron-lattice coupling coefficient et al,as well as the energy loss caused by thermal electron emission and multiphoton ionization emission at the boundary.The ablation process of the copper target irradiated by a Gauss type single pulse laser with a peak power density of 1.2×1017 W/m2,a wavelength of 800 nm and FWHM of 100 fs is numerically simulated.The results show that the electron emission caused by multiphoton ionization is stronger than that of heat electron emission,but the duration of the thermal electron emission is longer ;The energy loss of the electron emission caused by the multiphoton ionization is very high,which should not be ignored during the analysis of the femtosecond ablation process.