The applications of gray-scale mask technique in the fabrication of convex and concave microlens,hybrid refraction diffration microlens and microtip array are discussed. The several design and application examples of gray-scale mask used for fabricating several typical devices, such as convex and concave microlens, hybrid refraction-diffraction microlens and microtipstructure, are given. The research results about gray-scale mask technique can be apply t...