The abnormal vibration for power assembly of diesel engine in the Sports Utility Vehicle(SUV) is investigated by experiment analytical method in this paper. On the basis of the basic vibration analytical method for power assembly,vehicle road test and chassis dynamometer test are carried out, and modal experi ment is made in both test beds and real vehicles. According to the analysis of the vibration characteristics for power assembly, the abnormal vibration fact of control handle is discovered. It is found that the low stiffness of flywheel shell results in the low inherent system frequency of power assembly which is in working frequency range of the diesel engine, and then the whole system is resonated. The result shows that the inherent frequency of power assembly is improved by the way of improving structure of the flywheel shell, and the abnormal vibration of control handle caused by resonance is finally removed.