A multi-level grayscale-image enhancement method based on fuzzy technique is proposed to improve the contrast between homogeneous areas while saving textures.Nonlinear continuous stepped function based on statistical properties of the image is applied as membership function in fuzzy processing.The nonlinear enhancement is implemented by combining enhancement on each fuzzy sets.Comparing with classical methods,the results show that the image has higher contrast,enhance fine detail of image feature without enhancement,and it is better to representing the medical image processing,