As a part of the 13-year long, nationwide Land and Resource Investigations, multidisciplinary studies, concentrated on the coastal Quaternary geology, have been carrying out on the muddy coast of Binhai New Area, Tianjin and adjacent muddy coast along the west Bohai Bay. This paper, as a brief summary, introduces, most conscientiously, the results obtained in the past 13 years. The authors have submitted a number of reports, dealing with assessments of the in Nangang land reclamation area and coast of Huanghua Harbour, storm-surge prediction for Tianjin Harbour, soft mud distribution in the shallow sea area of Tianjin, site-choosing for artificial fishery reefs, investigation of the living oyster reefs in the shallow sea, island survey and so on.