To obtain a system analysis and research of the multi-field coupling effect on supers- onic triangular wing structure and aerodynamics in the procedure of aero heating, the Finite Element Method(FEM) and Computational Fluid Dynamics method were employed to build the numerical model of structure and aerodynamics of the wing. And then an interpolation method was used to fabricate the bi-lateral data transfer between CFD nodes and FEM nodes, which could couple heat flux and aerodynamics pressure in CFD with node temperature and displacement in FEM together. And after Iterative coupling simulation of CFD and FEM, the special properties of structure and aerodynamics of the delta wing under the consideration of multi-field coupling could be acquired. The verification simulation of a delta wing with the speed of mach 3 proved that the approach in this paper could give an accurate evaluation of both structure and aerodynamics for supersonic vehicles, thus it could be applied in the design of such airplanes.