According to the actual processing site, the damping system of deep hole drill pipe additional dynamic absorber was simplified, and the motion equations of the system and the damping indicators were gotten. Studying the damping characteristics of dynamic absorber vibration when the main system was resonant and non-resonant respectively, the design parameters of the undamped dynamic absorber were determined. Thus, in the stage of structural design, by selecting appropriate stiffness material, the damping effect of the undamped dynamic absorber will be best in work process.