Abstract: A detailed analysis of the aerodynamic and structural performances of the wings with different winglets has been presented in this paper.The aerodynamic performances of the wings with different winglets have been investigated by numerical method based on N-S equations.Comparison shows that the induced drag reduces,and the performance of the aircraft improves.The element model of the based wing and the wings with different winglets is built by MSC Patran,and the unsteady aerodynamic model is built by MSC Flds.The normal modes and frequencies are calculated by Nastran with SOL103.The characteristics of flutter are calculated by Nastran with SOL145.Comparison shows the influences of the characteristics of flutter.