Abstract: Groundwater is an important component of water resources and has significant implications for residents’ lives, urban construction, environmental protection, and more. Groundwater monitoring is a fundamental, public welfare, and strategic undertaking that provides favorable scientific and technological support for national spatial planning, water resource management, and ecological environment restoration. The national groundwater monitoring project has been in operation for many years, but there is still a shortage of supporting budget standards, and there is an urgent need to carry out research and development work. This paper starts from the background of the development of budget standards, focuses on various tasks during the operation and maintenance phase of the national groundwater monitoring project. Combining with relevant technical specifications and practical work in the geological industry, it introduces the content and characteristics of operation and maintenance work. Following the principles of scientific and applicable budget standard development, the development ideas and steps of budget standards are determined. The key points in the development process are analyzed from three stages: framework system construction, basic data collection, and budget standard calculation. Taking monitoring point inspection and verification as an example, the calculation mode of operation and maintenance budget standard of the national groundwater monitoring project is introduced. The development of budget standards for the operation and maintenance of national groundwater monitoring project can fill the gap of such projects without budget standards, improve the construction of budget standard systems, and ensure the stable operation of network system of the national groundwater monitoring project . The research mode and process are expected to have certain reference significance for the development of budget standards for monitoring and observation by the China Geological Survey.