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In engines,it is inevitable that the torsional vibration is produced by the fluctuation of the engine torque.Therefore,the torsional vibration damper is necessary to establish preventive measures to diminish the torsional vibration.In this paper,an experimental study was carried out in a gasoline engine to analyze the bolt tightening of torsinal vibration damper.The influence of the friction coefficient of the bolt of the torsional vibration damper,the material properties of the torsional vibration damper and the axial force calibration were studied.The results show that the changesinthe friction coefficientof the bolt and the material of the torsional vibration damper have great impacts on the bolt torque.It is effective to improve the bolt tightening state by checking the axial force and establishing suitable tightening parameters.