Abstract: The problem of parameter inversion in inhomogeneous medium was studied and a generalized ray approximation method to inverse 2-D medium parameters was introduced in this paper. By use of the referential variables and perturbational variables the medium parameters of wave equation were rewritten. Using the Green function theory, the integral equation of perturbational parameters was obtained. Based on the local principles of wave function in inhomogeneous medium, a generalized ray approximation form of total...