Abstract: Through tests for all the sections of the support frames under various section conditions,it was resulted that the whole rigidity can be improved by increasing the static rigidity of the frame and consequently the effect to the performance of the whole machinery can be eliminated due to insufficient rigidity of the frame.When the frame rigidity approached to the rigid body,the performance of machinery would not be obviously improved even if the frame rigidity would be further increased.The shapes changes of the frame sections have remarkable effect on the anti-deformation of the frame.Therefore,frame rigidity can be improved through selection of shapes the frame sections after machinery constructions were seasonable and satisfied the requirements.