In order to study the force transfer mechanism of the composite-hybrid beam joint section of long-span cable-stayed bridge，the 1/2 scale model test and finite element analysis were carried out based on the Fulong Bridge with 580 m main span. The influence of various parameters of the composite beam section on the axial force transfer path of the joint section was obtained. The results show that the axial force in the composite-hybrid beam joint section is transferred by the concrete，the deck，and the shear connectors on the embedded steel plates. The ratios of axial force carried by the bearing plate，the deck and the shear connector group are 32.2%，45% and 22.8%，respectively. By increasing the thickness of the bridge panel，the force transfer ratio of the bridge panel can be effectively improved and the force transfer ratio of the bearing plate can be reduced. By increasing the thickness of the top plate of composite beam，the force transfer ratio of shear connectors will be increased and the force transfer ratio of bridge deck can be reduced. When the bearing plate is thin，with the increase of the bearing plate thickness，the force transfer ratio of the bearing plate will be increased， and the force transfer ratio of the bridge deck and the shear connectors will be decreased.However， when the thickness of the bearing plate reaches a certain value，the load transfer ratio of each part can not be affected by the increase of bearing plate thickness.