Abstract: The short-term behaviours of 37 groundfluid items and their influence factors, including water level, water temperature, rate of flow, ions, dissolved gases, relseasing gases, soil gases in fault zone and meteorological factors, are in detail observated and studied in the Taipingzhuang well, Beijing. In this paper, some internal relations of short-term behaviours of some items on the common basis of the earth tide, atmosphere pressure and hydrodynamic condtions are revealed, and some behavior relations of dissolved gases, relseasing gases and soil gases, and of water temperature, soil temperature and air temperature are contrastly analysed.