Abstract: The effects of different process parameters on the microstructure and properties of Al-Cu-Mn alloy were investigated by means of continuous rheological extruder, optical microscope, scanning electron microscope and universal testing machine.The fracture mechanism of continuous rheological extrusion rod was analyzed, and the optimum rheological extrusion process parameters were obtained. The results show that under the condition of casting temperature of 690℃, working roll speed of 15 r/min, cooling water flow of 3 m³/h, the rod with diameter of 9.5 mm formed by continuous rheological extrusion has the best mechanical properties. Its tensile strength, yield strength and elongation are 340 MPa, 250 MPa and 28%, respectively. Compared with those of gravity casting at the same casting temperature (730℃), the tensile strength, yield strength and elongation of continuous rheo-extrusion casting rod at 730℃, 12.5 r/min, 3 m³/h are increased by 43.8%, 52% and 700%, respectively. The fracture form of Al-Cu-Mn alloy formed by continuous rheo-extrusion casting is ductile fracture, while the fracture form of Al-Cu-Mn alloy cast by gravity is brittleness and ductility mixed fracture.