At present, the demand response mode dominated by the seller’s market still has high reliability and enforceability.The response reliability models of different types of demand side loads are analyzed in order to reduce the impact of user behavior randomness on dispatching reliability. Dynamic response reliability evaluation models of different users are analyzed in order to improve the response enthusiasm of users. Finally, a dispatching model with the lowest operation cost and the highest reliability of dispatching capacity on the power grid side is constructed, which is constrained by the minimum clearing interests of users. The model can not only improve users’response enthusiasm, but also obtain the optimal dispatching operation mode of power grid interests.The effectiveness of the scheduling optimization model is verified by an example.