This paper attempts to analyze geothermy revealed by the sounding data at 8 h and 20 h every day from China Meteorological Administration and the data counted per minute such as the wellhead temperature, the electromagnetic disturbance, the ground tilt and so of water level instrument in Sanxing of Chengdu with the method of information digitization. The result shows the recognizable differentiation of the change process before and after the earthquake, provides an analytic method for the improvement of earthquake prediction or prevention, and shows the feasible further research and the wide application prospect.