Abstract: Put forward a kind of contact local contrast search algorithm.The node localization process through refresh,and its neighbors small areas of the distribution network of the mean value of feature nodes for comparison,the use of local wireless network node,the optimum information detection abnormal invasion node,avoid the traditional centralized information to all nodes of the search method in it.Experiments show that the algorithm can contact local contrast effective use of network information,abnormal node to realize accurate intrusion detection,shorten testing time.