Wireless Sensor Network, the self-organized network consists of lots of sensor nodes, which already applied in the monitoring areas, has potential application prospect in the sectors such as military, industrial control, city management, medical and health, environment monitoring, rescue relives and dangerous works, etc. "MIT technology commentary" lists WSN as the number one of the top 10 innovations of new trends. WSN also became the key study subject as it has already among the priority-developed industries in the national 2010 prospect plan and the 15th five-year plan.Sensor node design and implementation are the focus of the study of wireless sensor networks, In this paper, the existing wireless sensor network communication protocol and sensor node design based on the needs analysis is given based on the IEEE802.15.4 and ZigBee protocol, scalability Sensor nodes and the Sink node design, and the use of TI's CC2431 (integrated CC2420RF and 8051 CPU) to design the corresponding c..ircuit schematic and PCB.In addition, considering the wireless sensor network nodes' location of the sensitivity of the design of the software to fully utilization, the advantages of CC2431 is designed to achieve location-based positioning of the sensor nodes.After testing, the paper designes the sensor nodes that are in line with the electromagnetic compatibility and signal integrity requirements, RF part of the design specifications in line with the TI and the impedance matching circuit board design is right. Sensor nodes can be the correct data collection and transmission. Sink nodes can receive and send data to the target sensor nodes rightly or the target pc; In addition, Sink nodes as well as Sensor nodes have low-power, low-cost and small size and so on.
