Abstract: The flier-plate is the key element for achieving quasi-isentropic compression. In this paper, the developments and preparation methods of three kinds of porous flier-plates with gradient wave impedance were introduced as emphasis, based on the materials selection and design. Among them, gradient aerogels were considered as the flier-plate materials with good applicability, because of their nano-scale homogeneity and continuous adjustability of the density and thickness. At last, the problems of accurate impedance measurement and noncontinuous distribution were introduced. The accurate measurements of the density and sound velocity and three kinds of methods for preparing gradient flier-plate (including gradient sol co-gelation method, diffusion corrosion method and interface diffusion method) were suggested to solve these problems. The development of porous flier-plate with gradient wave impedance will help to prolong the loading time, improve the efficiency of the energy, and finally achieve higher loading pressure.