In order to study the characteristics of femtosecond laser ablation of stent material, two-temperature model which considers the thermal conduction between the electronics, and finite difference method were used to simulate temperature field of NiTi alloys during femtosecond laser ablation. According to the results, the influences of laser energy density, pulse width and delay time on the temperature field of electron and lattice were discussed. The results showed that the temperature of electron and lattice finally reached a state of equilibrium. Before that, firstly, the temperature of electron increased rapidly due to energy absorption, then, the absorbed energy was transferred to lattice through electron phonon coupling effect; at last, the equilibrium would be reached. Laser energy density played a major role in the equilibrium temperature, and pulse width determined the peak temperature and the time to reach it. Consequently，the temperature of electrons first increased and then decreased with the increase of the delay time, but lattice temperature only increased with the increase of the delay time. The results may have an important guiding significance to actual processing of femtosecond laser ablation of vascular stent.