The contradiction between the limited channel width of the 12.5-meter deep-water channel in the Yangtze Estuary and the demand for safe rendezvous of large-scale super-wide ships has become one of the main contradictions that need to be solved urgently. Since December 1，2018，using the slope to encounter by large cruise ships and large container ships in the Yangtze Estuary deep-water channel has changed from trial operation to normal operation. On the premise of ensuring the on-time operation of cruise ships in the deep-water channel，it is of great significance to study the impact of using slope encountering on deep-water maintenance and dredging. According to the measured data of using slope encountering，this paper analyzes its actual influence on dredging，studies the influence of using slope encountering on waterway dredging，and puts forward corresponding measures to ensure waterway dredging，which can provide important technical support for the influence of waterway maintenance and dredging brought about by the improvement of using slope encountering level in the future and the development of countermeasures.