Steel-concrete composite bridge decks with Π shape are widely used in cable-stayed bridges. Due to the bluff body shape, its aerodynamic properties are not as good as stream-line box decks’, and the shape should be optimized to enhance its wind-resistant performance. Based on a 300 m span cable-stayed bridge with Π shaped deck, a series of wind tunnel tests of section model are carried out in TJ-1 ABL wind tunnel, Tongji University. The aim of the tests is to select the best aerodynamic bridge deck shape from the three design shapes. After comparing the flutter and vortex-induced vibration aerodynamic performance of the three bridge deck shapes, some valuable conclusions are gotten. The influence of the bridge deck shape to the flutter aerodynamic performance is different with which to the vortex-induced vibration aerodynamic performance in some cases. By comparing with the results in uniform flow, turbulence flow can effectively reduced the risk and amplitude of the vortex-induced vibration due to the fluctuating components.