Abstract: The water cycle observation, as an important scientific basis for water resources investigation and water resources management, refers to the systematic and continuous observation of regional atmospheric precipitation, evaporation and transpiration, river runoff, cross-sectional flow, groundwater replenishment and drainage.Water cycle observation bases in China have witnessed three stages' development and achieved fruitful results, but there are some problems such as unreasonable spatial layout of observation bases, loss of representativeness of some regions due to urbanization, and old and backward equipment.To adapt to the integrated surface and groundwater resources survey, the Hefeng Basin in Ganzhou City of Jiangxi Province was chosen as a typical small watershed to build a water cycle observation base.In the context, this paper introduces the construction of Field Scientific Observation Base for water cycle of Hefeng Basin.In addition, based on the hydrogeology condition, a water cycle monitoring network was established in the Hefeng Basin.The remote sensing interpretation, atmospheric precipitation monitoring, surface water monitoring, groundwater dynamic monitoring, groundwater multilevel monitoring and other technical means were used for quantitative observation.Based on the field monitoring data, the groundwater-surface water transformation was preliminarily analyzed.