In this paper, electromagnetic (EM) scattering from a 3-D PEC target is simulated. The method of moments (MOM) with the pulse basis function and the point matching technique is presented to solve the magnetic field integral equation (MFIE). The flat triangular patch is applied to subdivide the surface of the 3-D target, and the surface unknowns are the arbitrary orthogonal unit vector of the triangular patch. Validity of this algorithm is shown by comparing the E plane and H plane radar cross section (RCS) from a sphere or a cylinder to those results of MOM with the RWG vector basis function. It is necessary to note that computational time of the algorithm presented in this paper is less than the MOM with the RWG(Rao Wilton Glisson) basis function.