Abstract: The Distributed Analytical Representation and Iterative Technique (DARIT) is proposed in this paper for the calculation of electromagnetic pulse (EMP) radiated field coupling to multi-conductor transmission lines (MTLs). Traditionally, the technique adopts the Jacobi iteration scheme (Jacobi- DARIT-field) or the Gauss-Seidel iteration scheme (Seidel-DARIT-field). More recently, based on these two methods, the JOR-DARIT-field and SOR-DARIT-field methods have been developed as well. This paper compares the four methods from the perspectives of accuracy and convergence speed, etc.