The new power system needs the cooperative optimization scheduling of "integration of source-network-load-storage". At present, the scheduling automation system uses relational database to query and store data based on multiple associated tables, which is diffi-cult to meet the requirement of fast computation. It proposes a graph-based calculation method for day-day scheduling of load-network-load-storage in this paper. Firstly, the graph database is used to integrate the spatiotemporal data of source network. Second-ly, considering thermal power units, adjustable load, energy storage and other resources, it constructs the optimization model of in-tra-day scheduling of source-network-load-storage collaboration. Thirdly, based on the safety check results, the system operating state is corrected until all operating constraints are met. A quick calculation method of power flow based on graph calculation is proposed to check system security quickly. Finally, Through the analysis of improved IEEE118 nodes and IEEE1354 examples, it is verified that the proposed source network co-optimization can im-prove the computing efficiency.