Abstract: Interface microstructure evolution of cold rolled Cu/Al laminate belt during annealing was studied. The results show that the velocity of generation and growth of the Cu/Al laminate belt metallurgical interface microstructure during annealing was quickly with increasing the annealing temperature. The evolution progress constituted of four stages, which were the incubation period, the island-like new born phase in some area, the transvers→longitudinal→transvers growth of diffusion layer, the formation of a new intermetallic compound and thickening of diffusion layer.