To explore the effect of ecological dredging coupled with ecological restoration technology on the restoration of polluted water，water quality indexes named total phosphorus，total nitrogen and chemical oxygen demand are selected as the research objects. Relying on the Baiyangdian endogenous pollution control pilot project，three working conditions are set for the target fish ponds：in situ management area，original retention area and ecological desilting coupled ecological restoration area. Through continuous sampling and detection，the variation rules of water quality under different working conditions are obtained. The results show as follows：1）The use of ecological dredging and in-situ restoration measures can promote the total phosphorus，total nitrogen，and chemical oxygen demand of the water to increase to the surface water Class V water standard，but the water quality is difficult to reach Class III water standard；2）Compared with only a single in-situ restoration technology，the ecological dredging coupled with ecological restoration technology has more advantages. After a certain period of time，the total phosphorus，total nitrogen and chemical oxygen demand indicators of the water will reach the surface water Class III.