Abstract: In the paper，the application of Barkhausen effect to inspect thermal damage on the bodies under the chrome layer for the inner cylinder and shaft pin of the landing gear were tested and studied. Through the analysis of sample test data from different surface conditions and the simulation of the different degrees of thermal damage, and together with the testing and verification for the real parts, the magnetoelastic parameter value of the different degrees of thermal damage were obtained. Determined optimal magnetizing parameters and process methods can effectively inspect thermal damage in the landing gear chrome parts.