Due to underground water without any rules to follow, water locations were more dispersed, it was difficult to control the pump pressure. To solve this problem, the decision of downhole pump more centrally electric control, voltage regulator for each part of the underground water supply, through the programmable controller PLC ladder diagram software development environment and application environment, more pump pressure regulating water supply electrical system schematic diagram was drew, a list of the I/O device address allocation and PLC program design, application and debugging were prepared, finally to centrally control for underground water pumps. The technology implemented the underground water system automation control, and can reduce the worker labor intensity.