Abstract: Incremental electricity distribution and retail company（IDR） has the characteristics of flexible resource diversification and business operation complication. Reasonably making the strategies of power purchase and sale and taking advantages of flexible resources are the keys for IDR to enhance the market competitiveness. Therefore, considering the characteristics of source-loadstorage planning and operation, a comprehensive decision-making model of multi-time-scale source-load-storage collaborative optimization for IDR is proposed. Firstly, from the actual demand for the transition from the current medium-and long-term electricity transactions to the spot market in China, a power purchasing model for IDR based on the electricity contract decomposition curve is constructed. Then, this paper uses the theory of user price elasticity and consumer psychology to simulate the user contract type selection and interruptible load response behavior in the retail link. Next, with the goal of maximizing the operation profit, a comprehensive optimization model of the decisions including the contracted power purchase portfolio, power sale pricing, user-side interruptible load procurement and deployment, and energy storage configuration and operation for IDR is constructed. Finally, this paper takes a regional IDR as an example for simulation analysis. The results show that IDR can flexibly respond to the changes in contract prices and user composition by comprehensively optimizing its source-load-storage decisionmaking to maximize the profit.