The sediment transport process and mechanism in a transition zone of salt marsh and mudflat was discussed through the observation of sedimentary dynamic process. Combined the data of multiple tidal cycles with the analysis of the vegetation cover, the influence of the vegetation on the dynamic and sedimentary processes of the tidal flat is studied. The results of the preliminary analysis show that: (1)Plants in salt marsh can reduce the tidal current velocity by 20%-60% and absorb most of the wave energy. (2) The SSC was related with the wave height, when the wave height is higher, the SSC in mudflat is higher than the salt marsh site, and the average SSC is higher, but when the wave height is relatively low, it showed an opposite situation. (3)The sediments in the mudflat is much coarser compared with the salt marsh, it is difficult to form and preserve various physical sedimentary structures in the mudflat.