Abstract: A conformal mesh-generating technique for FDTD analysis based on the object data originated from triangle-patch modeling in commercial software is presented. The crossing-points between grid lines and triangle-patch on the surface of objects are calculated using the projection and cross-point method. These cross-points are collated according to their coordinate values. The locations of conformal meshes and the corresponding length of the edges, which are used in the conformal FDTD method, are derived by considering the coordinates and the serial number’s parity of crossing-points. The conformal FDTD method, in which the magnetic field formulas are modified while the grid is on the curved surface, is then used to deal with electromagnetic scattering by a curved perfectly electric conductin