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Afinite element model of one-arm planet carrierwasbuilt, and influence of structuralparameters on strength and stiffness for one-arm planet carrierwasanalyzed. The stress and deformation of the round structure and the triangle structure for one-arm planet carrierwere analyzed and compared. The finite element model of the same specifications arms planet carrierwas established, and influence of the connecting slab thickness and input side plate thickness on strength and stiffness for armsplanet carrierwas analyzed. Strength, stiffness and mass for one-arm and arms planet carrier in thesame specificationswere analyzed and compared.