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Wireless sensor network is the core support technology in the framework of the Internet of Things. Environmental monitoring and devices control of intelligent building based on wireless sensor network is considered as one of the most crucial applications. It can perceive several environmental parameters and feedback control information to devices to provide more comfortable environment for people. However, it is difficult to ensure performance of wireless sensor network deployed in the buildings, because there usually are several serious disturbances from coexistence wireless systems and human actions. In this paper, we deploy a practical Intelligent Building Wireless Sensor Network (IBWSN) based on the analysis of actual spectrum, Link Quality Indicator, Received Signal Strength Indicator and Package Loss Rate. Performance evaluation proves that the presented system can satisfy the needs of the proposed applications for environmental monitoring and air-conditioning control.