Abstract: The environment and the condition of the dynamic observation of water temperature of the well of Tayuan station are briefly introduced. A long duration of data with hydrodynamic characteristicsthus collected has been systematically arranged in chronological order daily, monthly and annually in order to reveal the normalrule of secular changes and its interference action. Through the case study of some typical earthquake examples, some optimistic water temperature depth of the w ell for observation has been denoted. Based on this assumption, the measured tidal variation of the water temperature of the well in the relation with the anomalies of the co-seismic step change and the precursor of Tele-earthquake-a newly discovered phenomenon-are discussed.

Key words: Water temperature of the well, Micro-hydrodynamic flow, Tayuan well