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AODV routing protocol, which is simple and efficient, is often used in the wireless sensor network to transmit data. However, AODV routing protocol constructs the path from the source node that detects the target to the sink node. Whenever the target moves, the path will be reconstructed. The localization repair routing protocol set up a reconstruction area and restricted the RREQ packet to be broadcasted in it to avoid the broadcast storm. However, this method could not reconstruct the path once the target moves out of the reconstruction area. In this paper, we propose a lightweight routing protocol for mobile target detection. When the path is broken caused by the movement of the target, nodes can repair the path effectively through the presented routing information to save the energy and the cost.