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Linked tetra-shaft and double-cantilever flat flap gate is a new type of structure in water conservancyrnprojects ,but the traditional method is now adopted in its design. In order to the application and disseminationrnof the type of sluice ,this paper researches the difficult points of design advance ,through researching the mo-rntion locus & stress coundition of linked tetra-shaft system. The writer will build up the mathmatical modelrnand handle it with the computer. Thus, we can achieve the mod desing on the basis of the software ofrnlinked tetra-shaft system development.