In order to meet the security requirement of the dispatching data network and the features of its main applications, the principle of IP over SDH and the overall plan of Henan Power dispatching data network (HNDnet) based on IP over SDH is presented, together with the network architecture of the dual-plane backbone network and access network. Kernel design, network protection on communication side and routers access mode of Henan data dispatching network based on the dual-plane power communication network are illustrated in detail and some examples are given. Then a safer dispatching data network is provided.