Abstract: This study mainly discusses the effect of extrusion ratio on the microstructure and properties of aluminum alloys produced by rapid solidification and hot extrusion. Through experiments, aluminum alloy bars were prepared with different extrusion ratios, and their mechanical properties and microstructure were tested and analyzed. The results show that at an extrusion temperature of 350 ℃, with the increase of extrusion ratio, the aluminum alloy has a more flat grain boundary, but the grain size changes are not obvious; when the extrusion ratio is 25, the tensile strength is 646 MPa, and when the extrusion ratio is 16, the tensile strength is 644 MPa. The results provide theoretical guidance for the actual production and provide a basis for optimizing the process parameters of hot stripping extrusion.