Abstract: The dynamic environment in the adjacent waters of Weifang port is significantly affected by human activities. In this paper, grain size distribution pattern and its response to hydrodynamics are studied based on surface sediment parameters from 51 stations of the study area. The results indicate that the surface sediment of the study area is mainly composed of sand, silty sand and sandy silt, with small amount of silt. Grain size of the sediments is distributed in a pattern of fining from the shore to the sea in general. The surface sediments are getting finer on the west side of Weifang port, but become coarser on the east side. The sediment is dominated by suspended and saltation loads and with the increase of distance from the shore and the weakening of hydrodynamics, the saltation load decreases.