For substations in which the equipment has to be located dispersively because of the geographical conditions or the substations where communication cables are difficult to lay，the wireless ad-hoc network for the communication within a substation has more advantages.According to the characteristics of the intelligent monitoring and control system for distribution networks，this paper proposes a dendriform wireless ad-hoc communication network based on the SimpliciTI technology for the communication within a substation mentioned above.The principle of the monitoring terminal device and the data center device contained in the proposed dendriform network as well as the implementation process are described in detail.Then the data encryption method and the measures to improve the communication reliability are explained.Finally，an application example is given to show the reliability of the proposed wireless ad-hoc communication network.