Abstract : Micro-irrigation technology, as a mature technology, is widely used in agricultural production. Combining orchard micro-irrigation systems with locally adapted control systems has become a development direction for improving the efficiency and effectiveness of water-saving irrigation project management. The application of this system realizes high-tech and high-quality rural water-saving irrigation projects and will become an important part of new rural construction. Keywords : orchard; micro-irrigation; frequency converter; control technology 0 Introduction Taoshan Reservoir in Heilongjiang Province is located in Qitaihe City, mainly supplying urban water and irrigation water. The micro-irrigation project of the orchard on the north side of the reservoir covers an area of ​​39.1 hm². The main construction contents include water source engineering (including filtration equipment), control facilities, metering facilities, pipeline system, and micro-irrigation system. The water source engineering includes a reservoir-side pumping station, water pipelines, a mountain reservoir, and a water source well project, utilizing both surface water and groundwater. The micro-irrigation system is mainly drip irrigation. Micro-irrigation systems have been widely used in Heilongjiang Province, but the design and application of a distributed control system composed of multiple nodes, tailored to the actual conditions of this project, is still rare. The control system includes: ① pump station control section; ② water tank control section; ③ water source well control section. [b]1 Control System Design and Application 1.1 Pump Station Control Section (Water Source Cabinet)[/b] The water source cabinet receives control commands from the water tank cabinet and manages two step-down starting devices, each of which drives an 18 kW submersible pump. Considering the low load capacity of the mountain power grid, after receiving the start command from the water tank cabinet, the two step-down starting devices must be put into operation in shifts (this should also be the case during manual operation). The delay time for this process in the water source cabinet control unit is set to 20 seconds. Since the stopping process has a relatively small impact on the power grid, it can be executed simultaneously, so the stopping operations of the two pumps are completed simultaneously. The rising edge of the X0 input terminal of the control unit indicates that the start command has been received, and the falling edge of the X0 input terminal of the control unit indicates that the stop command has been received. This command is generated by the sensors in the water tank and the water tank cabinet, and issued by the water tank cabinet controller. The start and stop commands are generated by the combination of Y3, Y4, and Y5 of the controller and output through relay encoding. Once the start command is issued, the controller will automatically issue a stop command within the specified time interval, even if no stop command is received. [b][align=center]For details, please click: Design and Application of Micro-irrigation Control System for Taoshan Reservoir Orchard[/align][/b]