Due to the large amount of mining of the geothermal fluid, the water level and water temperature have decreased in Yujiatang geothermal field,how to accurately evaluate the recoverable resources is the primary task of sustainable development of geothermal fields.Based on the longtermdynamic data of water level, water temperature, water quality and water volume in the geothermal field from 2006 to 2016, using the statistical analysis method to calculate the maximum allowable water depth is 19m when the geothermal field is not lower than 38℃. Using lumped parameter model to simulate that the geothermal field can maintain the current average production amount unchanged, the maximum depth of the water level can reach 14. 5m; through inversion calculation, the recoverable resource when the water depth is reduced to 19m is 1523 m 3/d.At the same time, the amount of recoverable resources in the geothermal field is calculated by the analytical method of multiobservation hole pumping test in geothermal field, it fully proves the reliability of the method used in this study, and provides a reference for the rational development and utilization of geothermal resources in Yujiatang geothermal field.