The microstructure, mechanical and damping properties of ZK60 magnesium alloy in the solution treatment, ageing treatment and solution-ageing treatment states were investigated by using the optical microscope, tensile test and dynamic mechanical analyzer. The results show that the three heat treatments have some influences on the ultimate strength, the yield strength and the elongation of ZK60 magnesium alloys, and improve their damping properties to some extent. The influences of heat treatment technology on damping properties can be explained by the G-L theory.