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An improved design of wavy microchannel heat sink with changing wavelength or/and amplitude along the flow direction is proposed. The thermal resistance R and the maximum bottom wall temperature difference ΔT_b,max for the new design are compared with those for the straight and the original wavy design under a constant pumping power. The results show that the new design performance is enhanced significantly with lower R and smaller ΔT_b,max when the wavelength of wavy units decreases or the amplitude increases. The enhancement becomes more remarkably when the absolute value of the wavelength difference Δλ or amplitude difference ΔA between two adjacent wavy units increases. The performance can be further improved by simultaneously increasing the absolute values of Δλ and ΔA. Moreover, as compared with the straight and the original wavy microchannel heat sink, the reductions in R …