Abstract: Because of the limitation of energy and the huge number of nodes in a WSN, it takes a long time for all nodes to transmit a new program then the working period of the network becomes longer.

• 文章摘要: 由于无线传感器网络中节点的数量多和节点能量不足等原因，往往所有网络节点传输整个新程序要耗费相当长的时间，造成网络再进入工作的周期长。