Explosive welding can be defined as the process of joining two or more material by the detonation of explosives.The most characteristic of explosive welding is that it can combine same,especially different metals tightly,simply and quickly.In this investigation Aluminum alloys 2024/Copper T2 composite plates were obtained successfully by the method of explosive welding.The effect of annealing on the interface microstructures of the composite plates was investigated under different temperatures.Optical microscopy(OM),scanning electron microscopy(SEM)and microhardness test were performed.The results demonstrated that the Al/Cu composite plates were bonding well.The bonding interface of the Al/Cu composite plates was almost straight.The intermetallic compound Al2Cu was found near the interface of the composite plates.Microhardness measurements showed that the hardness of the composite plates near to the interface was higher than other parts and the hardness of the whole composite plates was lower after annealing.