Abstract: Transferring the aerodynamic load to FEM (flnite element method) nodes is a hard work but is very important. In order to transfer the two-dimensional aerodynamic load, a thin plate spline surface of the pressure is constructed according to the existing pressure on the aerodynamic nodes. Then the pressure on the FEM nodes can be computed. At last the concentrated force on the FEM Nodes can be obtained by integration of the pressure on the FEM elements. The large airplane often has complicated high-lift devices and their aerodynamic load may be three-dimensional. For the three-dimensional aerodynamic load, with the integration of the pressure on the aerodynamic webs, the concentrated force on the aerodynamic nodes can be obtained, and these forces can be transferred to the FEM nodes using the quadratic program method.