The finite element model of single arm planet carrier is built
and the influence of structural parameters on strength and stiffness of single arm planet carrier is analyzed. The stress and the deformation of the circular structure and the triangle one for single arm planet carrier are analyzed and compared. The finite element model of the same specification arms planet carrier is established
and the influence of the connecting slab thickness and the input side plate thickness on the strength and the stiffness for the arms planet carrier is analyzed. Aspects of the strength
the stiffness and the mass of the single arm and the arms planet carrier in the same specifications are analyzed and compared.