Abstract: The method of estimate the wettability of peach leaf surfaces was studied.The surface free energy and its component of the adaxial and abaxial surfaces of peach leaves in different growing periods were determined by OWRK method.The results showed that with the growing of the leaves,the surface free energy and the wettability decreased on both surfaces.The proportion of its polar component also decreased,while the proportion of its dispersion component increased.The result is consistent with the conclusion of previous research on the variation in the amount and composition of epicuticular waxes in peach leaves.The research proved that OWRK method is reliable to determine the surface free energy and its component,and it reflects the wettability and energy feature of peach leaf surfaces.