Abstract: The variation in suspended sediment concentration (SSC) has an important impact on coastal engineering and the maintenance of waterways. Typhoon occurs frequently along Zhejiang coasts in summer, after the typhoon passes, the suspended sediment concentration will change significantly. In this study, the distributions of SSC during Typhoon Soulik (July 2013) were observed through hourly geostationary satellite remote sensing images and an appropriate remote sensing model. To quantitatively analyse the SSC variation between normal weather and typhoons days, we determined the representative date of normal weather by the lunar date. The results indicate that the SSC increased in Hangzhou Bay after Typhoon Soulik, and in the middle of Hangzhou Bay, the SSC increased by 0.10-0.50 kg/m³, and the increase of SSC near high and low time was greater than other moments. The vertical mixing caused by the increase of wind stress and the enhancement of vertical shear stress during typhoon are the main reasons for the increase of sediment concentration, and the vertical process transports the SSC below the surface to surface.