Abstract: Taking mountain and arid areas of Bayannaoer City as an example, relying on the calculation and analysis project of effective utilization coefficient of farmland irrigation water in mountain and arid areas of Bayannaoer City and the research and demonstration project of integrated technology of agricultural precision water distribution in Hetao Irrigation Area hosted by the Water Conservancy Development Center of Hetao Irrigation Area of Inner Mongolia, the integrated water automatic monitor Zhihui was used to monitor farmland soil moisture. The experiment showed that the use of the integrated automatic water monitoring instrument Zhishi provided a time-saving monitoring way for the calculation of the effective utilization coefficient of farmland irrigation water in the mountainous and arid regions of Bayannur City, which could accurately and real-time know the irrigation location, irrigation time, irrigation water volume and soil water content at any time, and provide a reference for differentiated agricultural irrigation. It provides a choice for further realizing the automatic monitoring of soil moisture content in non-saline-alkali land farmland, precise water distribution in modern agriculture and automatic control irrigation technology, and guides the rational distribution of water resources.