By means of the monitoring system the daily and seasonal variation of spring in the Taihang Mountain had been observed and studied. A daily spring water flow model was built. It was found that the daily spring water flow and the soil heat flux presented a close negative correlation relation in which both of them shows a sine curve of 24 hours period and the maximum correlation coefficient has reached 0.93. The phase of the heat flux has three hours ahead of spring flow. The seasonal increase of spring water flow is mainly due to the supplement of rainfall.