Abstract: 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. The decadal changes for the last 130 years are separated into 4 phases, which reveal how the natural recession following the post-LIA temperature rise was gradually replaced by the human activities, esp. the accelerating reclamation since 2000. Nine peaks found in a Holocene marine sedimentary record and seven storm-drawn events, esp. found in the late Holocene, indicate strengthened marine influences in the local muddy coast. A good use of these results represents a logic way of understanding the modern muddy coastal process with geological background.