In　recent　years,　research　on　propagation　characteristic　of　wave　in　inhomogeneous　media　attracts　much　attention　among　experts　and　scholars　in　various　domains.　First,　mathematic　expression　for　scattering　cross　section　P()　in　inhomogeneous　is　deduced.　Then,　quantization　of　Kramers-Kronig　relation　in　inhomogeneous　medium　containing　scatterers　is　given.　Based　on　the　frequency　change,　the　phase　velocity　due　to　the　inhomogeneous　material　is　introduced　into　two-dimensional　Born　approximation　formula.　Finally,　this　paper　reconstructs　the　flaw　shapes　in　inhomogeneous　medium　using　backscattered　ultrasound　through　experimental　method　and　the　results　verify　the　feasibility　of　flaw　scattering　theory.　©　2010　IEEE.