Temperature and stress distribution of Nd∶YVO4 crystal are simulated according to the difference of optical absorption properties of Nd∶YVO4 crystals pumped by 808 nm and 888 nm, respectively. The changes of crystal temperature distribution and thermal focal length are also simulated when the pumping beam polarization components in a-axis and c-axis are changed. From simulation results, the crystal temperature gradient with 888 nm pump-wavelength is one sixth than that of 808 nm and the crystal temperature stress value is much less than that of 808 nm pump-wavelength. The resonator and output power are not affected by the change of pumping beam’s polarization because the light absorption coefficients on a-axis and c-axis of Nd∶YVO4 are the same when pump wavelength is 888 nm. This is one of the effective ways to reduce Nd∶YVO4 crystals thermal effect and increase Nd∶YVO4 laser power with 888 nm pump-wavelength.