Abstract: The problem of dynamic routing of telephone network is very important, which has been studied for many years in the communications field. China uses equipment of various types coming from various factories, so to solve the problem is more difficult than in other countries. In this paper, a logic model of the problem of dynamic routing telephone network and a method to solve the problem are proposed based on the logic model, and LMBDR, the dynamic routing system of telephone network is described using the method. Based on the logic model of the problem of dynamic routing telephone network, LMBDR can give the plan of routing telephone network. The advantages and disadvantages of the method are analyzed and some problems to be solved in the future are suggested.