In order to meet the low power requirement of IPv6 wireless sensor network, this paper adopted the adaptation layer routing. Based on the LOAD Protocol, the paper proposed a simplified on-demand routing algorithm. The algorithm adopts simplified routing control messages, routing table and route request table. In addition, the algorithm simplifies the route discovery process and optimizes the route maintenance mechanism. The simulation results show that this algorithm can reduce the power consumption of the IPv6 wireless sensor network effectively.