The machining of the deep hole is the most difficult machining procedure under a certain closed condition. And the vibration caused in the machining of the deep hole is one of the more difficult problems need to be solved. This paper illustrates the vibration types in the machining of the deep hole. Then the reasons which cause vibration in this machining have been analyzed, especially for the main factor of the vibration caused by the elastic deformation of the drill rod. Finally, through the research procedures of the drilling machine and drilling tools for the deep holes, this paper presents vibration suppression methods in the machining of the deep hole.