关键词: 无线传感器网络, 路由树, 交叉退避窗口

Abstract: In wireless sensor networks，the sink inject a message into network，with the message flooding，a tree topology established.The traditional backoff mechanism and routing strategies easy cause fierce collision，the route easy to paralyze and non-optimized routing tree.In this paper，a wireless sensor network optimization routing tree algorithm is proposed.This algorithm defines route valid term，the father node priority queue，and proposes the overlapping backoff window strategy.Simulation result shows this algorithm can construct the route tree effectively.

Key words: Wireless Sensor Networks（WSN）, routing tree, overlapping backoff window