Abstract: The existing communication organization modality based on synchronous digital hierarchy (SDH) within the Yalong watershed can't satisfy the demands for the construction of the Yalong River energy base with integrated hydro, wind, and solar power. Grounded on the analysis of the issues confronted by the extant communication network and the subsequent requirements of the centralized control and dispatch communication network in the basin, the bandwidth allocation networking strategy and estimation approach are presented in accordance with the relationship between the quantity of stations put into operation and the bandwidth requirements. A construction blueprint for the centralized control and dispatch communication network in the basin founded on the optical transport network (OTN) source-network service platform is put forward, and specific technical deliberations and engineering construction notions are carried out in terms of technology system selection, business landing modality, key technologies for long-station-distance access, and the establishment of self-healing protection mechanisms. The communication networking demand scheme expounded in this paper establishes a theoretical estimation model in conjunction with engineering practice. The scheme avails itself fully of the existing resources of the plants and the grid to efficaciously reduce the production input for supplementary construction, and holds practical reference significance for the phased implementation of subsequent system engineering.