ThroughWall detection is usually in the external environment with many scatterers. Whether metal objects or people exist or not has different effects on wall parameters inversion, and further affects the accuracy of locating and imaging through the wall. Different external environment is simplified different scenes. A model of electromagnetic wave propagation through the wall is built according to the theory of electromagnetic wave propagation and the Fresnel equations, and the theory and procedure of extend prony method for enhancement resolution in a SFCW throughwall radar and wall parameters inversion fast algorithm are described. A method of wall permittivity and thickness inversion is presented, and the experiment is performed in multiscenes. At last, the results of the experiments are contrasted with the true value. It is concluded that the method is highly adaptable in different scenes, and the wall parameters calculated are valuable references of throughwall detection in reality.