Abstract: To solve the route security issue in mobility scenarios and especially the route reconstruction security issue after the network topology changes in wireless sensor networks,an immediate,fast,secure and energy-efficient route algorithm were proposed,which could provide new nodes or mobile nodes with the immediate and efficient data transfer paths and could help sensor nodes adapt the network topology changes by moving the sink node and reconstructing the route.Compared with other secure route protocols that need to reconstruct the route from the beginning,this algorithm is better in terms of communication overhead and route reconstructing time.