Abstract:An optimization method about layout of exhaust hangers location was presented by analytic hierarchy process(AHP). Based on the exhaust hangers location of a vehicle, its finite element analysis modal was established by HYPERMESH. Then the numerical modal analysis and experimental modal analysis was carried out, which verified the reasonability of the finite element analysis modal. Firstly, the weight of each order modal shape was calculated by analytic hierarchy process (AHP), then each mode shapes of all reference points are weighted sum by average driving degree of freedom (ADDOFD). We reselect position having the smaller displacement (ADDOFD) as the hangers’ location. In order to verify the reasonableness of designed location, frequency response analysis, static analysis, constraint modal analysis and real car verification were carried on the exhaust system. Compared with optimization scheme and initial scheme, the force delivered to vehicle body decreased obviously to meet the requirements of maximum force less than 10N and the vibration of seats rail also decreased obviously. The Results indicate that the optimization hanger layout meet requirement.