Yucheng City is a concentrated area of Dongying Formation for the exploitation and utilization of thermal reservior geothermal resources. Due to the concentrated exploitation of geothermal resources and the direct discharge of geothermal tailwater, a series of geological environmental problems, such as water chemical pollution, thermal pollution and pressure drop of thermal reservoir have been caused. Based on the investigation of the exploitation and utilization of geothermal resources in Yucheng City, the geothermal reinjection experiment was carried out in the Xitingshuian of Yucheng City. Based on the data obtained from the reinjection experiment, the relationship between the reinjection amount and the reinjection pressure, the influence of the reinjection on the water quality of the thermal reservoir, and the influence pattern of the reinjection on the temperature of the thermal reservoir were analyzed and studied, and the maximum reinjection amount was calculated based on the curve fitting the relationship between the reinjection amount and the water level rise.The results show that the amount of reinjection increases with the increase of pressure, and the unit reinjection decreases with the increase of pressure.Because the reinjection well is filled with water with a higher salinity than its own geothermal water, the salinity of the geothermal water collected after the reinjection is higher than that before the reinjection test. However, since the thermal reservoir mined by the reinjection well belongs to the same layer, the influence of the reinjection on the water quality of the thermal reservoir is small. In this test, the spacing between wells is large, so the reinjection has no influence on the temperature of the thermal reservoir.The calculation determined that the maximum reinjection amount of the reinjection well was 70m3/h.This study provides a basis for the sustainable development and utilization of the geothermal resources in Yucheng City.