Suspended sediment is one of the important parameters to evaluate the quality of Case II Waters. As the suspended sediment in coastal waters has a certain adsorption effect on heavy metals and nutrients, its distribution characteristics can reflect transferring and circling of pollutants to some extent. Therefore, the study of suspended sediment is of great significance to the construction and environmental protection of Bohai Bay, China. In order to explore the variations of sediment index and distribution of suspended sediment in Bohai Bay, the suspended sediment index of the Bohai Bay is retrieved by band combination from the multi-spectral satellite image of GF-1, and the suspended sediment indexes of the nine months in 2019 are obtained. It is found that the suspended sediment in Bohai Bay is greatly influenced by monsoon in winter, and in spring and summer, the suspended sediment of high concentration shrinks towards nearshore. Besides, the distribution pattern of suspended sediment in fall has a trend of transition to that of winter. The study provides an important scientific basis and reference for the ecological environment protection and industrial development in Bohai Bay.