Leakage issue in production line significantly influence Assembly shop FTC and lead to rework cost and risks.For the leakage defect cars,research on rivets damage force,rivet sequence,and also use complete car CMM measurement methodscan find out the main reason that results in thedefect,next use short term solution to temporarily control the batch issue.At last,optimize the unqualified supplier parts and change rivet sequence to totally solve this issue.Engineering verification shows the whole methods and process are stable and effective.