Combined with actual application of ZigBee in monitoring on ancient and famous trees

the ZigBee routing algorithm used in the system is improved from the view of maximizing lifetime of network. Using characteristic of data transmitssion in a fixed direction in system

control on transmission direction of RREQ packets to reduce unnecessary RREQ packets

and decrease losses of node energy caused by flooding of RREQ. By dividing nodes into different energy regions

it makes the energy of node can be used in balanced and avoids node in low energy being excessively used

so as to prolong survival time of network. Results of simulation using NS—2show that numbers of RREQ packets in the network are significantly reduced and the rate of node survival is increased. It effectively improves monitoring range and efficiency of system.