Abstract: Based on the observation data of current and suspended sediment concentration of four current measuring stations in Yancheng inshore sea area (between Sheyang port and Dafeng port) in 2018 for 25 consecutive hours in summer and winter, the hydrodynamic characteristics of the area are preliminarily analyzed. The results show that the main direction of the tidal current from Xinyang port to simaoyou estuary is basically consistent with the trend of the isobath, showing obvious reciprocating flow characteristics, and Sheyang port is attached In the near station (JS-YWPY01 station), the rising tide is mainly in SW direction, and the ebb tide is mainly in NNE direction; in JS-YWPY02, JS-YWPY03 and JS-YWPY04 stations, the rising tide is mainly in SE direction, and the ebb tide is mainly in NW direction, and the rising tide velocity in JS-YWPY03 and JS-YWPY04 station is greater than the ebb tide velocity; in 25 h, there are two ebb tides, the ebb tide duration is greater than the ebb tide duration, while the rising tide velocity is greater than the ebb tide velocity, and the maximum ebb tide velocity occurs The velocity generally occurs at the middle tide level, and the minimum velocity occurs at the high tide or low tide. The tide in the survey area belongs to normal semidiurnal tide, and the tide presents significant change characteristics in the observation period.