Abstract: In the path-key establishment phase of existing pre-distribution key management schemes,there are many problems,such as long path-key establishment path,high communication overhead,and low secure network connectivity growth rate.In order to resolve these problems,an enhanced scheme for establishing the path-key is proposed.In path-key set up phase,the proposed scheme makes full use of the pre-distributed keys in the securely connected neighboring nodes within the communication range of the node,and increases the number of nodes used to negotiate the path-key.Analysis and comparison results between the enhanced scheme and the original scheme without the enhanced method show that with the enhanced scheme,secure network connectivity rate is obviously improved,and it achieves to 1 quickly.Moreover,the enhanced scheme needs much less pre-distributed keys to achieve the prospective network connectivity rate.