With increasing span length of bridge, bridge construction quality is more and more light, structural stiffness is more and more small, structural damping is more and more low, which led to the sensitivity of the wind-induced role is more and more big. Based on the main girder static coefficients measured by wind tunnel tests and wind load nonlinear, and considering geometrically nonlinear, the whole process of the static wind instability of long-span suspension bridge will be analyzed, as well as large-span cable-stayed bridge; Then the sensitivity aerostatic stability parameters of long span cable supported bridge, which contains of static coefficients, the initial wind angle of attack, the bridge tower wind loads and the rope wind loads and side cross wind load, were investigated.