The observation scale of well water temperature is already large in China，which plays an important role in the monitoring and prediction of earthquake by providing valuable information of geodynamics． However，some important problems are also exposed simultaneously，which include the naming of observation items，the stability of observation instruments，and the optimum place of temperature sensors in a well． If these problems are not solved，the further development of observation technology of well water temperature and its effects of earthquake monitoring and prediction will certainly be affected．