Abstract: A unified modeling scheme of full-business in the control center based on time dimension is proposed for the inadequacy of the smart grid dispatching and control system.In the scheme,specific solutions of some key technologies have been proposed,such as the unified maintenance technology for the model of full-business in the control center based on time dimension,the extraction of the business model of time section,model cooperative validation technology,model submittal to online system based on construction task,etc.The scheme has been pilot applied in the control center.Practice shows that it can achieve unified maintenance and management for multi-time scales and multi-application models while providing data support for full-business systems collaboration in the control center.Isolated from the operation and maintenance of the smart grid dispatching and control system,the scheme has improved the stability and the reliability of the system.