Lianyungang port 300 000 DWT waterway is a typical deep waterway in the mucky shallows of open waters characterized by large excavation thickness, long waterways, large engineering scale and complex construction conditions. By research, the nature of the seabed and beach stability, hydrodynamic sediment conditions, waterway sedimentation, waterway route selection, navigation security, and other major technical problems, are basically solved. The results not only lay a solid foundation for the follow-up study design Lianyungang port waterway, but also may serve as a reference for the construction of other mucky shallows deep water channel. The main technical problems are summarized.