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For the demands of wireless monitoring, a wireless monitoring system based on STM32F4 microprocessor is designed. The system consists of four parts:sensor module, main controller module, wireless transmission module and monitoring terminal module. It has many functions such as sensor driving, auto alarming, remote monitoring and so on. This article focuses on a detailed description of the overall programme, principles and performance parameters of each module, design of the system software. After many times of debug and test, it not only has achieved the expected function, but also has good prospects for practical application. 