Abstract: A method of the surface fitting of three-dimensional bodies is presented in this paper. The longitudinal lofting curves are a chain of conies generated by the least square fitting, whereas cross-sectional curves are hybrid blended conies which contain circular arcs, elliptic arcs and straight lines. A FORTRAN program involving the computer graphics on the SIEMENS 7.760 computer has been written. The program is capable of quick and handy generation of the complicated configuration of 3-D bodies and surface meshes required in the aerodynamic influence coefficient method. The applicability and validity are verified by some numerical examples. Further development of the program enables it to be a graphic master dimensional system for computer aided design.