The diversity of source nectwork load and storage leads to increasingly complex causes of current grid anomalies. In order to make full use of the valuable flexible resources on the demand side, a demand- side cooperative scheduling optimization method based on abnormal abductive reasoning is proposed. Firstly, a method of abductive reasoning based on Bayesian network is proposed. Secondly, based on the limit scenario method to deal with fan and load fluctuations, the day-ahead distributed dispatching model of power grid considering flexible load is constructed. Finally, four scenarios are set for comparative analysis. The numerical results show that the proposed method can effectively alleviate the abnormal trend of regional tidal current index.