Research conclusions: The concrete stress of the bridge is at a reasonable level，the structure is safe and reliable; The distribution of the beam normal stress is non － uniform，beam stress distribution in section away from the arch foot is more uniform; The vertical and horizontal diaphragm separator system，which was made by the multiple webs and multi － diaphragm plates，can make a strong overall performance of the bridge structure of the Department，the maximum Transverse displacement difference is only 0． 51mm; It is necessary to set vertical prestressed tendons for the foot of the arch which can reduce the interface with the concrete beam principal tensile stress effectively，and enhance the interface shear strength．