Abstract: 7075 aluminum alloy casting rod was prepared by using semi-solid slurry preparation process of low superheat pouring with a shear field (LSPSF), and homogenization treatment, hot extrusion and T6 heat treatment were carried out in sequence. The effect of hot extrusion and heat treatment on microstructure and tensile properties of the aluminum alloy was investigated. The results show that the near spherical grains in the as-cast aluminum alloy changed into irregular shapes in the process of hot extrusion. The relatively obvious grain boundary in the structure of the aluminum alloy was formed after T6 treatment. (110) crystal plane in the microstructure of the aluminum alloy had preferred orientation after treated by hot extrusion and T6 heat treatment. The tensile strength and yield strength of the aluminum alloy treated by hot extrusion increased by 136% and 140% comparing with those of the aluminum alloy in as-cast state, respectively. After T6 heat treatment, the tensile strength and yield strength were further improved. The fracture mode of the aluminum alloy in as-cast state was brittle fracture, and the fracture modes after hot extrusion and T6 heat treatment were both ductile fracture.