The dam of Tuanzhouyuan in Yueyang City serves as the research subject. FLAC3D software is employed to develop an unsaturated seepage calculation program, which is then utilized to perform thermo-hydro-mechanical (THM) coupling calculations for the levee. The program enables a detailed analysis of the distribution patterns of the seepage field and temperature field within the levee body and its foundation. By doing so, the study aims to elucidate the correlation between the seepage field and the temperature field comprehensively. Moreover, through an in - depth analysis of the evolution characteristics of the backwater slope temperature and flow velocity, the feasibility of using infrared detection for identifying seepage - related hidden dangers is demonstrated. The research findings reveal a strong synchronicity between the variations in the seepage field of the levee foundation and the evolution of temperature. Specifically, when the flow velocity at the measurement points within the levee body and foundation increases, the temperature shows a sharp decline. By capturing the difference between the temperature at any given moment and the initial temperature at different positions on the backwater slope, it becomes possible to accurately locate the seepage center. This achievement can contribute significantly to realizing the objective of “early detection and effective response” in flood control and emergency rescue operations.