A parallel improved version of the Gauss-Jordan elimination algorithm for solving large-scale dense linear system on CUDA is proposed in this paper.After analyzing the procedure of Gauss-Jordan elimination algorithm and the constraints of CUDA,it gives a new logical organization ofgrid-strip-group-block-threadand the concepts ofbased lineandglobal based line,based on which the parallel version of the Gauss-Jordan elimination algorithm on CUDA is proposed.The numerical experiment of test instances with max s...