The mechanical properties and texture evolution of AZ31 Mg alloy extruded at different die temperatures are investigated in this paper. It is found that the grains of alloy are refined after extrusion. The tensile strength and yield strength are significantly enhanced, but the elongation is not increased notablely. The tensile strength, yield strength and elongation of the sample extruded at 20 ℃ are 322 MPa, 233 MPa and 21%, respectively. The frequencies of high angle grain boundaries of the as-extruded samples are raised with increasing the extrusion temperatures, which indicates that the dynamic recrystallization is more and more sufficient. The basal ring type texture has been formed in the as-extruded samples, and a significant decrease in the intensity of basal ring type texture is detected. Our study reveals that the mechanical properties of AZ31 Mg alloy are not only related with the average grain size, but also with the texture.