Abstract: A high quality and efficient structural dynamic grid method based on the radial basis function (RBF) and the transfinite interpolation (TFI) was presented for static aeroelastic modification of wind tunnel models. First, a RBF method in which center points were reduced was used to update vertex coordinates on edges of structural grid blocks, and then the TFI method was adopted to generate the deformed surface grids and volume grids. A dynamic grid example of airfoil rotation demonstrates that the dynamic grid method can generate high quality deformed grids. The static aeroelastic modification of an F6 wing-body model was investigated based on the dynamic grid method and model deformation data in wind tunnels. The modification results show that the maximal coefficient variation induced by model deformation is far beyond the error limit of wind tunnel experimental data, and the static aeroelastic modification has an important practical value on improving data accuracy in wind tunnel experiments.