To solve the problem of oil leakage of connection between casting housingand the rear cover,using finite element methodtosimulate the position that mostprobability leak,and then give theadvises to the designer.Firstly using Hypermeshto meshall the part from the axle and set interface and then exportsthe inp file.Secondly use the Python language to set the load step.Thirdly use the Dos window to invoke the standard of ABAQUS solver to calculate.Comparethe calculation results with the actual failure,so as to put forward a more reasonable design change.