Based on recent years’ construction experience on the Yangtze River estuary 12.5 m deepwater channel maintenance dredging engineering,we analyze its engineering characteristics.In view of the severe conflict between the dredging operation and channel safe traffic,high quality requirements,complicated external environment and the fact that the actual back-silting volume exceeds significantly the contractual volume,we propose key control points such as knowing well back-silting discipline,focusing on operation progress control,safety control and external coordination to meet project requirements.