Abstract: Analysis is based on a certain composite UAV and the finite elements model of airfoil is established by the CATIA.When its material properties,load distribution and magnitude are determined,the analysis of its static strength and modal will be accomplished by ABAQUS.Numerical results of the stress distribution and the deformation are obtained.The judgement of whether the wing's composite structures are damaged or not can be made by the maximum stress theory and the Tsai-Wu tensor theory,and the safe evaluation is carried out for the wing's modal by the Lanzcos' principle.Its feasibility of engineering is finally analyzed.