Abstract: The effect of Al content on the properties of Al_xCoCrFeNi was studied by molecular dynamics simulation method, and the stress-strain analysis, potential energy strain analysis, common neighbor analysis, dislocation density analysis and other operations were performed on the results. The results show that the lattice distortion of Al_xCoCrFeNi gradually intensifies, the dislocation slip time of the material and the phase transition from FCC structure to BCC, HCP and other structure advance, resulting in the gradual reduction of the tensile strength of the material and the corresponding strain value with the increase of Al content from 0.1 to 0.5. The strain value of dislocation decreases with the increase of Al content, which is mainly 1/6＜112＞ dislocation and unknown dislocation structure. The dislocation appears before the yield point, and with each increase of Al mol ratio by 0.2, the dislocation appears 10.5% earlier than the yield point. The transformation of the crystal structure also occurs earlier with the increase of Al content.