An analysis method to investigate the characteristics of three dimensional behaviour of a suspension bridge after construction is presented in this study. A nonlinear static analysis program for the suspension bridge is also developed. Three dimensional frame element with 7 degrees of freedom at each node including warping and flexural-torsional coupling effect is used to model towers and stiffening girders. Generally, cable is an element which has no resistance to bending and compression but only resistance to tension. Therefore, main cables exhibit complex nonlinear behaviour because of the large deformation when they are loaded. In order to consider these effects, elastic catenary cable element developed from the exact solution of a nonlinear differential equation of an elastic catenary cable subjected to self-weight is used to model main cable and hangers. Through Nam-Hae bridge analysis, it has been found that procedures suggested in this study can be applied effectively to three dimensional nonlinear static analysis of a suspension bridge.