Aerodynamic problems of super long span cable-stayed bridge are investigated based on Sutong Bridge.Dynamic properies, wind loading, identification of flutter derivatives based on full aeroelastic bridge model, logitudinal structural system and vortex excited vibration are mainly focused on. Researches show that vertical stiffiness will decrease with wind speed if the nonlinearity of deformation of stay cables under later wind loading is considered. It is also found that Fixed - Fixed system is the most suitable for long span cable stayed bridge under logitudinal wind loading. Identification method of flutter derivatives through full aeroelastic bridge model is proposed. In the end, some discussions on vortex excited vibration and Rehnilds number effect are intoduced.