Abstract: In order to accurately evaluate the operation benefit of independent energy storage participation in the market and solve the problem of mechanism design of independent energy storage participation in the power spot market,an evaluation method of market benefit of independent energy storage participation in the market based on ideal scheduling was proposed. This method constructs a benefit evaluation model based on two layers architecture. The upper architecture is the optimal scheduling scheme of the day-ahead spot market without the participation of independent energy storage,as a control scenario. The lower architecture is the optimal scheduling scheme of the day-ahead spot market considering the participation of independent energy storage,which is the ideal scheduling scenario. The difference of market electricity purchase cost in the above two scenarios reflects the change of electricity purchase cost caused by independent energy storage’s participation in the market,which can be used as a reference index for evaluation of its participation in the market operation benefit. The calculation example based on IEEE 30-bus system structure shows that after the participation of independent energy storage,the power purchase cost decreases by nearly 139. 1 thousand yuan,the TOU price decreases by 0. 05yuan/（kW·h）in peak hours,and the wind abandoned power decreases by 91 MW·h. The results show that the participation of independent energy storage in the market can alleviate the tension of peak power supply and im-prove the capacity of new energy consumption. The proposed evaluation index can quantify the participation benefit of independent energy storage,which can be used as the basis for the formulation of its compensation standard and help promote the participation of independent energy storage in the electricity spot market.