Becaues the current
Multi\|Layer Flat Container is working under high and complex stresses state, it is easy to break and
its life is short.In order to solve this problem, the FEM is applied to analyze the
Multi\|Layer Flat Container in this paper.And on the base of this study, the stress distributing rules have been obtained in diverse structure parameter.1.While radius of the inner sleeve increases, the
equivalent stress of fitting decreases quickly and the equivalent stress of working also increases quickly. On the other hand, while the radius of the interlayer sleeve increases, the equivalent stress of fitting is decease slowness and the equivalent stress of working is also decease slowness.2.While the quantity of relative overlap of the inner\|interlayer sleeve increases, the equivalent stress of fitting is decease and the equivalent stress of working is also decease slowness. On the other hand, while the quantity of relative overlap of the interlayer exterior sleeve increases, the equivalent stress of fitting is decease quickly and the equivalent stress of working is decease slowness. On the base of this study, the optimal project by adjusting the structure parameter is obtained. The structure parameter include the radius of the inner sleeve, the radius of the interlayer sleeve, the quantity of relative overlap of the inner\|interlayer sleeve and the quantity of relative overlap of the interlayer exterior sleeve.These projects are feasible and efficiently to improve the state of stress.These conclusion have very importance to make current multi\|layer flat container.