Equilibrium equation and compatibility equation are deduced to get the cable force equation and cable displacement control equation. Then the expression of characteristic parameter λ 2 in cable force equation is deduced. Meanwhile, the influence on the increment of cable force and displacement caused by λ 2 and load ratio P is analyzed. On this basis, taking 3 000 m span suspension bridge as a calculating example, the characteristics of the increment of cable force and cable displacement under symmetrical and asymmetrical load are studied. In this case, two different conditions are considered. One takes the elastic elongation into consideration, but the other does not. At last, compared with the steel cable, the influence on the parameter in cable force equation and displacement control equation caused by span is analyzed. The influence of the static performance of suspension bridge by parameter changing is analyzed as well. The substantive characteristics of the static performance of super span CFRP suspension bridge are cleared and the superiority and characteristics of CFRP cable structure are demonstrated in theory.