Abstract: Ultrasonic dispersion characteristics of porous layered materials are studied.Using the eigenfunction expansion method,and using the relationship between elastic constants and density of materials with porosity to calculate the phase velocity dispersion curves for Rayleigh waves in different porosity iron-based alumina layered materials,and the effects of porosity of the iron-based alumina layered materials on Rayleigh waves phase velocity are discussed in detail. The dispersion curves for Rayleigh waves can reflect the information of elastic modulus,Poisson ratio,density and porosity in layered materials,and the conclusion can be useful to study inverse properties of porous layered materials.