In this paper, an improved Floyd algorithm is proposed, based on Gauss-Seidel iteration thought and detailed analysis of the characteristics of industrial railway network.The improved Floyd algorithm successfully solved the key issue of the simulation optimization software, which is used to the industrial railway transportation.Using of Seidel iteration thought, the algorithm's iteration number is decreased from n to two, which effectively reduced the computational complexity.At the same time, it is a very good solution to the problem of railway angular, because of the using of the railway angular algorithm.