A wireless sensor-actor network is a kind of distributed sensing and control system which ioined the various actuators on the basis of the WSN.The sensing nodes in network are intensive,huge quantity and covering a large area,while the number of control nodes is relatively small Aiming at the characters of wide range of area,large amount of information,and complexity of real-time transmission in rural district,this paper developed a wireless sensor-actor network used for greenhouse environment surveillance system which consists of sensor nodes and control nodes.Since in this system energy efficiency is one of the most decisive factors of designing node,a new protocol was used,which adopted synchronization algorithm to resolve beacon conflict. Moreover,a method of using reactive strategy was presented in the paper in order to select the suitable equipment,by which the performance of wireless sensor actor network was improving.According to the fact of rural district and characteristic of wireless sensor,a feasible wireless sensor actor network used in farmland area was designed and had solved the practical application problems of network structure,such as node localization,route search and energy supervision.