Abstract: The temperature increase of powder particles was computed with different laser power as the main parameter,and it was used as an initial condition in analyzing temperature field of both single and multiple laser cladding with birth-death element method.The reliability of the model was verified by the dimension and morphology of the molten pool.The temperature of particles increases linearly with laser power being increased.The temperature curve of single clad shows a sawtooth type,in which the temperature increases linearly and decreases as half of a hyperbolic curve.The temperature field of multiple cladding shows a backward dragged ellipse.The thermal cycle of every node goes though some several incremental peaks and tends to a stable state in the end.