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Welding of copper and aluminium has been problematic with tradition fusion method. The friction stir welding (FSW) was employed to butt weld the T2 copper and 1061 aluminum alloy plates. The welding parameters were planned by the orthogonal experiment design method. The samples obtained in experiments were investigated in the aspects of microstructure, tensile strength, fatigue performance and micro-hardness.Sound weld with the best tensile strength and fatigue life was produced under the welding parameters of rotation speed, 1100rpm and welding speed 50mm/min. The tensile strength was 193.16MPa, 85% of the base aluminium material. Three intermetallic compounds (IMC) of CuAl, Cu3Al and Cu9Al4 were detected at the copper-aluminium interface in XRD analysis.

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