In this research,a kind of sensor nodes which uses CC2430 chip as the core was designed and used to monitor the environment of a greenhouse，and it consists of sensors of temperature,humidity,illuminance and the like. Additionally,every sensor node keeps some accesses open to other sensors. Every node works effectively in the communicational form of frequency division multiple access (FDMA) to transmit information,which consists of a relative small wireless sensor network (WSN). The nodes which are in a greenhouse canopy and collect data transmit information through their own channels to gate node which is out of the greenhouse canopy and eventually transmits the collected information making use of serial port to personal computer that reserves them via a software. In the process of practical production,it indicates that under the communicational system of FDMA，the wireless sensor nodes were stable，highly efficient and much lowlier in energy consumption to monitor the greenhouse canopy.