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This article from the small tooth number difference planetary gear drive theory, introduces the development history of ring reducer, which also introduced some scholars on the ring reducer research. This paper focuses on tricyclic and double ring gear reducer transmission principle, body types, as well as on their way to overcome dead point position, compares the similarities and differences.This paper focuses on the research of Double-ring Gear reducer, using PRO / E software on the double ring gear reducer were accurate 3D modeling, and all the parts are assembled into a whole. In order to verify the gear parameter selection is reasonable, the assembly end of the double ring gear reducer for interference checking, and the movement simulation animation, more clearly see the motion characteristics of Double-ring Gear reducer. Based on the double-loop reducer of stress analysis, found that the research object of this paper has some shortcomings, the research object of this paper is to put forward to modify an opinion, and on the modified structure of the theory of stress analysis, the stress variation.