In order to study the yield mechanism of branched spherical plate joints wrapped in lattice concrete filled steel tubular wind power tower,static load experiment was conducted on 4 full-scale models of CFST universal joints.Then,software ABAQUS was used for non-linear finite element analysis.By changing the radius-thickness ratio of the inclusion,thickness of gusset plats,the failure mode of joints and the equivalent stress of gusset plates and the equivalent stress of joints intersection area were analyzed. The results indicate that the damage of the universal joint was caused by the failure of the weld failure between gusset plate and steel ball and buckling of compressive bar.The bearing capacity of the universal joint is sensitive to the thickness of the gusset plat, but it is weak sensitive to the radius-thickness ratio of the inclusion. The thicker the nodal plate, the better the dissipation of the equivalent force; when the radius-thickness ratio of the inclusion is no more than 38.5(γ<38.5), the bearing capacity of joints decreases large amplitude with the increase of γ; when the radius-thickness ratio of the inclusion is greater than 38.5, the bearing capacity of joints decreases small amplitude with the increase of γ. It is suggested that the radius-thickness ratio of the inclusion is 38.5;when the thickness of the joint plate is no more than 14, the bearing capacity of joints increase large amplitude with the increase of n, when the thickness of the joint pate is greater than 14, the bearing capacity of joints increase small with the increase of n.