Abstract: The software was used to simulate the temperature field of laser cladding AlCo_xCrFeNi_xTiB high-entropy alloy powder on TC4 substrate, and the temperature distribution cloud diagram, temperature thermal cycle curve and temperature change rate curve of the same node under constant cladding rate and different cladding powers were obtained.The geometrical dimensions of the macroscopic morphology of the molten pool obtained by the simulation were calculated, and the experimental verification completed.The results show that when other conditions remain unchange, when the laser cladding power increases from 1000 W to 1300 W, the maximum cladding temperature increases from 1892.6 ℃to 2278.1 ℃, and the experimental molten pool width increases from 3.36 mm to 3.84 mm, with an increase of 14.28%.The melting depth of the substrate increases from 0.65 mm to 1.01 mm, with an increase of 55.38%.When the power P=1300 W and the feed rate is V=5 mm/s, the best molten pool shape is obtained.