Abstract: This paper Investigates the impact damper nttnched to the foreed vibrntion system with nslnglo degrce of frcedom. The dnmper consists of an auxilinry mnss paftiele moving in n container fixed to the main vibrating system. In this paper, the exnet solutions of the differential equations of motion are presented, and the approximate solution of the main system is also discussed at resonance. Baaing upon the analysis for Approximate solution, the author has discussed tho effect of the dnmpor mid hns derived the formulas for the elemental parameters of the damper, The results of theoretical analysis Indicate that the damper is quite effective In the region of resonance. The results predicted by experiment and theoretical analysis are roughly in agreement.