Taking the muddy coast of Bohai Bay as an example, this paper summarizes the Holocene shoreline migrations and marine impacts from morphological and stratigraphical evidence onto the local coastal evolution. The shoreline migrations of the millennial scale since the middle Holocene were characterized by at least six times of alternation between standstills (forming shelly cheniers and earthy mounds) and progradations. A good use of these results represents a logic way of un- derstanding the modern muddy coastal process with geological background.