Abstract: with the continuous development of modern agricultural production, more and more agricultural products are picked from the greenhouse. With the more common application of greenhouse, the economic and social value created by greenhouse is increasingly prominent. The traditional greenhouse relies on manual measurement and control of temperature and humidity, which not only needs a lot of time and energy, but also has low efficiency. In modern greenhouse, most of them use intelligent control system, which can automatically monitor and control the growth of crops, and has a certain impact on the output of crops. In recent years, the development of various types of sensors and single-chip computers has promoted the continuous development and improvement of greenhouse intelligent detection system. At present, the wireless fidelity technology has the characteristics of wide coverage and high transmission rate, which makes the development of wireless LAN unprecedented prosperity. This paper will design and implement a kind of indoor environment monitoring system based on Wi Fi technology. Then according to gainspan platform, the wireless communication module, power module, processor module and sensor module are constructed to obtain real-time humidity, temperature and other data information, connect the server and the node, so as to realize the wireless transmission of data and complete the collection and processing of environmental information. The server of the system will achieve the accurate positioning of each node based on the different wireless signal strength RSSI of each node, and build the web real-time observation platform through the B / S architecture, and receive the real-time sensor data information under the communication network, so as to achieve the positioning, monitoring and other targets within the monitoring range. Modern wireless sensor network can realize information collection, transmission and processing. It is an intelligent integrated information processing system, which integrates advanced science and technology such as wireless communication technology, sensor technology, fractional information processing technology and embedded computing technology. There are many cheap micro sensor nodes in wireless sensor network. They use wireless communication mode to form a network system, in order to achieve a comprehensive and coordinated perception and processing of the data information of the target object.<BR>
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