The aerodynamic shape design of the serrated trailing edge for the Lambda （λ） wing increases the aspect ratio and improves the aerodynamic efficiency， however， this results in a greater structural mass. Therefore， an aerodynamic/structural multidisciplinary design optimization method is proposed for the λ wing of fighters. The key steps include parametric modeling for wing configuration and structural layout， automatic generation of the wing aerodynamic model and aerodynamic optimization， automatic generation of the wing structural finite element model and the wing structural layout/size optimization. The aerodynamic and structural optimization modules are integrated in the ISIGHT software environment， and the multi-level optimization method based on the surrogate model is used to solve the multi-objective optimization problem. The example results show that the optimization method can better take both the aerodynamic and structural performance into account of the λ wing. Thus， the proposed approach can further improve the efficiency of the preliminary design.