Abstract: A model for the discharge of the Xin’an Spring was developed with timeseries analysis method. The water resources in the basin from 1981 to 2006 were evaluated with the model and compared with the water resources under natural conditions. Based on the research results, the following conclusions can be drawn: (1) the function of the Xin’an Spring system is deteriorating, (2) deterioration is caused by groundwater withdrawal from the basin as well as the decrease in precipitation in the basin, and (3) the Xin’an Spring system can still maintain the stability of its water resources under current conditions.