Abstract: The access of large-scale distributed generators （DGs） such as distributed photovoltaics to the power grid increases the demand for dispatch flexibility of distribution network and the difficulty of traditional centralized control modes.Therefore,a twostage intraday distributed optimal dispatch method for the distribution network considering the robust balance between the flexibility supply and demand is proposed.In the first stage,considering the uncertainty of net load and the flexibility supply capacity of the distribution network,a robust balance index on the flexibility supply and demand of DG cluster （DGC） is proposed,and a DGC partition model of the distribution network is established combined with the modularity index.In the second stage,according to the DGC partition results,an intraday distributed optimal dispatch model suitable for DGC is established,and a synchronous alternating direction method of multipliers （SADMM） is used to solve this problem.Finally,the effectiveness of the proposed method is verified by taking the IEEE 33-bus system as an example.