Abstract: The water temperature tide phenomenon is studied using the 4 years observations data obtained in Well Ji-16. The following tasks are carried out: （1） comparing water temperature observations with theoretically calculated values of body strain tides; （2） comparing relative phase changes between water temperature observations and theoretical body strain tide; （3） analyzing the long term characteristics of diurnal variation and short time variations at different time of the water temperaturature observations. The conclusion is the water temperature observations from Well Ji-16 have a good tidal effect, which can be used to explain the decreases of the diurnal variation amplitude through the micro dynamic change process of tidal effect. A large amount of data is used to analyze the water temperature tide phenomenon in this paper, which can provide a reference for the research of related topics.