Abstract: The re search on geothermal precursor is a characteristicshort-term prediction method that has a good effect in the earthquake prediction practic e. The Seismological Bureau of Jiangsu Province built up a set of digital geothermal synthetical observation stations during “the Ninth Five-Year Plan”, and accumulated plenty of observational data and some earthquakesamples of geothem. During re search and observation, we found that the digital geothermal data has many virtues suchas a bundant available information, high precision of observation, stable normaldy namics, easily judged anomaly, sensitiveresponse of earthquake, and soon. Digital geothermal data was well used and multi-analyzed in this paper. Basedon the study of normalcy characteristics and interferential factors, we summed up some methods in judging and analy zing the anomalies. The relation between geothermal anomalies and earthquakes arealso discussed by using typical earthquakesamples in this paper.

Key words: Geothermal anomaly, Digital observation, Normaldy namics, Interferential factor