Abstract : In this paper, we apply the finite element method (FEM) to model and compute the capacitance and inductance per unit length matrices of symmetrical coupled microstrip lines with different dielectric constants and without. We mainly focus on modeling shielded symmetrical coupled microstrip lines and open symmetrical coupled microstrip lines, respectively. Also, we illustrate the meshing and the potential distribution of the transmission lines for the models. We compare some of our results with those obtained by other methods and found them to be in good agreement. Keywords: Finite element method, Capacitance and inuductance matrices, Coupled microstrip lines