Abstract: Research on frame joint has an important practical significance because it has an important impact of the bearing capacity of the whole frame structure. Based on the reinforcement engineering of a super transfinite office, this paper has presented octagon reinforcement method. By using the numerical simulative analysis of one-time loading and low reversed cyclic loading for the six different reinforced frame joints, the stress of reinforcements and steel plates, the deformation of joints, the figure of cracks, the load-displacement curve and the hysteresis curve have been obtained. The failure model of the frame joints reinforced by octagon reinforcement method mainly is ductile fracture in beam end, which has been presented through analyzing the developing process of cracks. By analyzing the load-displacement curve and hysteresis curve of the frame joints under three kinds of axial compression ratio which is 0.2,0.5and 0.8, octagon reinforcement method has increased the core concrete area of frame joint, the shear strength of frame joint and the ductility and seismic performance of frame joint. Octagon reinforcement method is more significant than enlarging section method when the axial compression ratios are larger.