Abstract: Based on sensor node’s geographical location information and energy consumption model analysis of network transmission path, this paper proposed a QoS routing algorithm for wireless sensor networks, which will control the forward nodes sequence of multihop transmission path in the source node and sink node connection area, to fit the source node and sink node connection transmission, and effectively control the transmission path. The paper also proposed to improve the QoS routing algorithm, by which the forward nodes can dynamically adjust the size of transmission path area based on the current realtime QoS constraints and optimize the next hop selection mechanism, so that the routing path can maximize the fitting of the straight line between source node and sink node to achieve the optimal path transmission energy consumption. The simulation experiments show that the QoS routing algorithm for wireless sensor networks can achieve the network QoS constraints, while save the network energy consumption and prolong the network life.