Abstract: Based on the 238 surface sediment samples taken from the Laizhou Bay in the years of 2007, 2014 and 2015 as well as their analysis results, the authors studied the migration trend of the surface sediments in the bay. Also discussed is the influence of tide and wave on the movement of seabed sediment with the method of two-dimensional grain size trend analysis (GSTA). Results show that the study area may be divided into several depositional and erosional centers. The tide along is effective enough to move the most of surface sediments, except in the area near the inshore waters on the southwest side of the abandoned Yellow River estuary and the northeast waters of the Weifang port. The area strongly effected by wave is very wide.