Abstract: According to actual need for Shenyang fire fighting command and communication system, the optimum path from fire fighting team station to fire site was solved in GIS environment. The base of the optimum path was established by off line search, such that the requirement of real time was satisfied with. This paper described how the mathematic model for the optimum path was establshed and how the parameters in the model were solved by using inherited algarithms and sample path.