Traditional granary monitoring system adopts ＲS-485 and CAN bus or other cable transmission modes，in which there exist problems of wiring complexity，high cost，high failure rate and difficult to maintain，etc． Aiming at these problems，this paper designs a kind of granary temperature and humidity monitoring systembased on Zigbee． Grain monitoring network is mainly composed of the Zigbee sensor nodes and the sink node，and the sensor node is composed of CC2430 combined with temperature and humidity sensor SHT11． The sink node is responsible for receiving data from the sensor nodes and then the data will be processed by the CC2430，and is de-livered to monitoring center PC through the ＲS232 serial port，thus realizing the temperature and humidity data ac-quisition，display and storage．