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Wireless Sensor Network (WSN), a new generation of sensor network, of which development and application profound influence will be generated to every domain of human-being. The structure of wireless sensor network is the basis, and its performance directly affects system performance. So the research of the WSN structure is very necessary. This paper describes the application architecture of Wireless Sensor Network and communication mechanism, through analyzing the Wireless Sensor Network node Telosb and TinyOS which is the operating system running on it. The work done by this paper can provide a reference solution for related research projects or applications in related fields.