The temperature field of laser-induced plasma in laser welding is hard to be obtained by the spectral analysis method. By using fast Fourier transform (FFT) and Hankel inversion algorithms, a data processing method based on Abel inversion for measuring temperature distribution of plasma is studied. Meanwhile the precision in the process of the dada is analyzed. The standard error e was about 3.23×10-2 at the number of dispersed points N of 41. The results show that the data process method can be very useful in the observation of the temperature filed of laser-induced plasma by using a multi-channel spectral analyzer. The temperature of plasma plume in the center area of laser beam appeared to be higher than the area near the laser beam.