Distribution and Utilization communication network carries not only the information of distribution network control, but also the information of all the distributed energy resources and power consumption measurement. However, the data flow and services flow prediction is very hard to plan and predict. This paper proposed the model that was very useful for the capacity and structure of distribution and utilization communication network planning. In this model, we considered service reliability and redundant requirement, calculated the data flow of telecommunication network backbone communication nodes according to the services kinds and each service basic data flow that each kind of communication points carries. In this model, we also analysed the service section between the backbone communication nodes and accessing points, and gave a new service data flow calculating method of all kinds of services which flows toward 35kV power station.