The ambient temperature has an important influence on the mechanical properties of aircraft composite structures. In order to better grasp the mechanical properties of carbon fiber/resin matrix composite laminates at different temperatures, W-3021FF/LY 1564 SPT/XB 3487 was used. The tensile and compressive mechanical properties of composites were tested at -54℃, 25℃(the room temperature) and 71℃ respectively under the wet molding process. The fracture surface of the mechanical properties samples was analyzed by SEM. The results show that compared with the room temperature environment, the bonding strength of carbon fiber and epoxy resin matrix in low temperature environment was enhanced, and the tensile and compressive strength of composite laminates was improved; while the bonding strength of carbon fiber and epoxy resin matrix was weakened in high temperature environment, the tensile and compressive strength of composite samples were reduced.