Taking CNC pipe thread lathe with drilling collar and drilling pipe as the research object, three dimensional solid model of the bed was established through Pro/E software.By using Ansys software,dynamic analysis was carried out to simulate the natural frequency and energy distribution of the bed structure.Then the coefficient of variation was proposed to judge the uniformity of energy distribution, and the weak points was found in combination with the vibration analysis,which laid foundation for the stability of the machine tool processing.