Inthe principles of equal cable stiffness and equal cable strength, two cable-stayed suspension bridges using CFRP cables with a main span of 800 meters were established. Three-dimensional nonlinear method was taken to analyse the static charasteristis of the bridges in thefinished state. Compared with the bridge using steel cables with the same structural arrangement, some conclusions were drawn about the effect of different cable materials on the static charasteristics of large span cable-stayed suspension bridges. Under the condition of same structural arrangement, cable-stayed suspension bridges using different cables show a similar flexural status. In the principle of equal cable stiffness, the CFRP bridge show better performance in strength and stiffness. While in the principle of equal cable strength, CFRP bridge show worse performance
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