Abstract: This paper mainly introduces a distribution network "accurate planning + active loss reduction" system based on business distribution big data fusion. The system takes the accurate planning and active loss reduction of 10kV and below distribution network as the research direction, takes the line logical name and distribution transformer topology relationship model as the main line, and forms the indicators related to current superposition, reactive power optimization and line transformation screening. Apply research and development cross system data collection and processing tools to break the data barrier between production, marketing and integrated power management system and line loss management system. Comprehensively evaluate the development trend of equipment current, reactive power, loss and other indicators.