Abstract: The needs of a wireless sensor network node are analyzed with the architecture of the node described. According to the protocol 802.15.4, the design mode of the node consisting of the main controller ATmega128L and CC2420 RF transmission is adopted in modular form including the wireless communication, processor, sensor and power supply modules, thus implementing the design as a whole. Comparing the test results of data packets sending/receiving rates varying with the distance from the nodes thus designed with those from Micaz nodes and temperature data acquired by temperature sensor, the designed node shows a favorable effect and provides further a high performance hardware platform for in-depth study of wireless sensor networks.