Based on the new energy power prediction data with the highest probability of occurrence to check the security and stability of the deterministic dispatching plan,the conclusion is quite different from the actual situation of the power grid. In order to improve the adaptability of the results,a security and stability checking method of dispatching plan considering uncertainty of new energy is proposed. Based on the quantitative assessment results of the safety and stability of traditional deterministic dispatching plan,a safety and stability margin minimization model with confidence interval constraints on the predicted power of new energy stations is constructed to realize effective identification of high-risk planning modes. Based on the active power sensitivity,the equivalence aggregation and uncertainty variable dimensionality reduction of new energy stations are carried out to improve the efficiency of the security and stability margin minimization model. Based on the parallel processing platform,the multi-mode grouping parallel security check of the dispatching plan is carried out. The results of security and stability check considering the uncertainty of new energy power prediction are obtained. The proposed method can effectively improve the accuracy and timeliness of the security and stability check of the high-proportion new energy grid dispatching plan. The effectiveness of the proposed method is verified by an actual grid case.