With the development of electricity market, it is possible for pumped storage units to participant in spot market or auxiliary service market. Driven by policies such as environmental assessment and clean energy consumption, pumped storage units have space to exert their market power. The problems such as high proportion of intermittent energy fluctuations, equipment failures,large fluctuations in load, and slow climb of large units are analyzed.Thetypicalscenariosandmechanismof the distributed pumpedstorages’market power are clarified. Based on the optimal power flow and probability methods, the market power of the distributed pumpedstoragesystemisquantitativelyevaluated.