Abstract: In minimum hop count routing protocol，the network is divided into a cluster of concentric rings which relay on the distance of ordinary nodes and sink node and the radio range of a node.After data collection，data packages are directed to sink instead of broadcasting in the whole network，and when a command needed，it is diffused though the direct that the hop increasing by one hop.Based on the advantage of this protocol，this paper improves on network setup phase and data transmission phase.Depending on the simulation in OMNET++，compared to flooding and original minimum hop count protocol，the behavior of the improvement is obviously.The result of simulation validates the feasibility of the improvement.