Abstract: Line loss rate is an important indicator reflecting the economic operation of China's distribution network. Starting from the calculation formula of distribution network line loss, design a dynamic detection system for synchronous line loss based on SOA. Massive data processing is carried out through web servers, database servers, and backend workstations, with real-time monitoring and evaluation to accurately grasp potential risks such as abnormal line loss or power theft and leakage. Propose a systematic, scientific, and efficient solution.