Abstract: Suspended sediment concentration (SSC), as the basis for sediment flux balance, is an important parameter in marine sedimentology. Based on the survey and hydrological observations at 10 stations in the Jinghai Bay and its adjacent waters, SSC in different layers is calculated, and the SSC horizontal and vertical distribution patterns and the transportation of suspended sediment are analyzed. Data show that SSC changes with the variation of tide current and runoff, and increases from the surface to the bottom and from southwest to northeast. The mechanism of longitudinal suspended sediment transport shows that sediments move toward the land and Wuleidao Bay where flood tide dominates, but move towards the sea near the Changhuikou area where ebb tide dominants.