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The main failure forms: 1. The shaft are lack of fatigue strength and the fatigue crack guess, because of the lack of static strength and plastic deformation or brittle crack guess, wear, exceed the permitted range of deformation and vibration, etc.2. The design of shaft should meet the following criteria:(1) according to the working conditions of the axis, the production batch and economy principle, selecting suitable material, blank form and heat treatment method.(2) according to the force of the shaft, the shaft parts installation position, coordination with the size and processing method of positioning way, the shaft concrete requirements, determine the reasonable structure shape and size of shaft, the shaft structure design.(3) the strength calculation and checking.To force large (such as a worm shaft) and slender shaft of high rigidity axis, stiffness calculation.Work on the high speed shaft, because there is a risk of resonance, reason should be vibration stability calculation.