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In order to increase the efficiency of micro-topography preparation,the technical approach of bionic geometrical structure was adopted to optimize the shape of toothed wheel.Based on the observation that some soil burrowing animals with strong burrowing ability have special tooth-like structures on their digging organs.The characteristics of these structures were studied,and their essence and commonality were abstracted.Then,the tooth-like structures were simplified and represented by bionic serrated structures and were used for the design of tooth cutting edge.