In order to study the influence of the femtosecond multi-pulsed laser accumulation effect on the Ni-Ti alloy material, by considering the time interval to rewrite the laser source terms in the two-temperature equation, improving the two-temperature model, and using the finite-difference method, the distribution of femtosecond three-pulse laser ablation of Ni-Ti alloy temperature field was simulated. The temperature evolution of electron and lattice with time and ablation depth was attained, and the internal mechanism of multi-pulse accumulation effect was also analyzed. Then the influence of different parameters on the temperature of electrons and lattices under the condition of three pulses was discussed. The results show that, under the ablation of the femtosecond three-pulses on Ni-Ti materials, electron has three increments of peak temperature, which is compared with the effect of single pulse, the three- pulses make the electron and lattice temperature increase significantly. The time interval is an important parameter for multi-pulse, which can directly affect the accumulation effect of multi- pulses. The pulse width mainly affects the peak temperature and the time to reach the peak temperature. The laser energy density mainly affects the temperature of electrons and lattices. The electron-lattice coupling coefficient also has an important influence on the coupling time of electron and lattice and the equilibrium temperature of electron and lattice.