An analytical formula of temperature distrbution in La0.67Ca0.33MnO3 (LCMO) film irradiated by KrF excimer laser is presented using one-dimensional thermodiffusion model. The relation between surface temperature and irradiation duration of pulsed laser is obtained. Fitting the laser induced thermoelectric voltage (LITV) response waveform of LCMO film, it shows that the time constant is 1.39 μs. The thermal diffusion coefficient and conduction length of the film are calculated, and the results are 4.5×10-8 m2/s and 71 nm respectively. Based on the time constant and a simplified LITV formula, the anisotropy Seeback coefficient of thin films can be deduced, and it is 2.80 μV/K for LCMO.