Abstract: The temperature field distribution of CoNiCrAlY alloy powder coated on TC4 matrix by laser cladding was simulated by software.The temperature distribution nephogram, thermal cycle curve and temperature change rate curve in the same node were obtained under different power and scanning speed, and the macroscopic morphology and geometry size of the simulated molten pool were calculated.The results show that the temperature gradient in front of the laser travel direction becomes denser and the temperature changes faster. Theoretically, the excellent metallurgical bonding can be obtained when power of P=1000 W, feeding rate of v=5 mm/s and spot diameter of d=φ3 mm.