To cope with the multiple stochastic factors of power system with large-scale renewable energy, a multi-time scale dispatching mode is proposed. The proposed mode is based on the rolling optimization of “robust dispatching plan” + “robust operational region”. First, the problems of traditional dispatching mode are analyzed. Based on these problems, an improved mode of robust dispatching is put forward. Then, the implementation process of robust dispatching is detailed and an example is studied to demonstrate the process. The advantages of the proposed mode are verified by comparing with the traditional dispatching mode. Finally, the key technologies to realize the proposed robust dispatching mode are discussed, which can provide the reference for the dispatching of power system connected with large-scale renewable energy.