Carbon nanotube （CNT） reinforced aluminum matrix （CNT/Al） composites have the advantages of light weight，high strength，high modulus，and easy processing，and have a great application prospect in the aerospace field as lightweight materials.In order to obtain a lightweight structural material with both good mechanical properties and perfect damping capacity，the 1.5%（mass fraction） CNT/2A12 composite is prepared by flake powder metallurgy and elemental alloying.When the composite is aged at 130 ℃ for 6~14 h，it exhibits high tensile strength and good ductility.The tensile strength is up to 595 MPa at 12 h of aging，and the elongation is up to 14.0% at 8 h of aging.The damping capacity of the composite is about 0.005 at 0~180 ℃，but significantly increases at 180~300 ℃，reaching 0.05 at 300 ℃.The damping capacity is hardly affected by the aging time.The storage modulus of the composite decreases when the test temperature increases，and increases at 180~300 ℃ when the vibration frequency increases.Taking the overall properties into consideration，at 130 ℃ and 8 h，the 1.5%（mass fraction） CNT/2A12 composite has the optimal mechanical properties and damping capacity.