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Compared to crank-rocker riding rice transplanter, the speed of rotary rice transplanter is doubled. In addition, the force impact on the ends of the rotative phase of double helix axis are five times stronger with the quality of feeder moving mechanism and rice seedings box is added. So the abrasion between the slider and the slide is more serious. In order to reduce the abrasion and impact, buffer springs were equipped to both ends of the double helix axis. By setting up the kinematic and dynamic models of slider and slide and writing the optimizing program, the optimal curve in rotative trough at both ends of the double helix axis and the stiffness coefficient of the buffer spring were obtained. After optimization, the force between the slider and the slide were cut down observably referring to the buffer spring added to both ends of the double helix axis, which maked the use of nylon material instead of rolled steel to produce double-helix axis feasible. Nylon materials and rolled steel were used to produce double-helix axis and slide, then comparison experiments of attrition resistance were carried out. The result of the experiments indicated wear-resisting nylon 66 double-helix axis and quench steel No.45 could conform to the rice transplanter’s working longevity.