In order to control suspended solids and their concentrations in a targeted manner, improve water transparency and the water environment, based on monthly suspended solids monitoring and historical data from 51 monitoring sections of 20 major rivers and lakes from 1985 to 2023 in Shanghai, the spatial distribution and variation characteristics of suspended solids in tidal rivers and lakes in Shanghai were analyzed, and the impact of tidal characteristics on suspended solids and measures to control suspended solids in tidal rivers and lakes were discussed. The results show that the major rivers and lakes in Shanghai all have high concentrations of suspended solids; the suspended solids concentration in rivers and lakes in the eastern region is generally higher than that in the western region, but the suspended solids concentration in rivers and lakes in the entire region has shown a downward trend; the seasonal fluctuation of suspended solids concentration in large open-type rivers and lakes is significant, while the seasonal fluctuation of suspended solids concentration in controlled rivers and lakes is relatively small; the suspended solids in rivers and lakes in tidal river network areas are often in a state of change and transport due to the influence of tides. To control suspended solids, it is necessary to fully rely on the tidal characteristics, transport characteristics, and distribution characteristics of suspended solids, and make full use of tidal hydrodynamic characteristics. However, it is necessary to consider the risk of increasing the concentration of suspended solids in the receiving water body. It is suggested to reduce external inputs as the primary measure for tidal rivers and lakes with suspended solids as the main component. Keywords: suspended solids; spatiotemporal distribution; tidal; river system; Shanghai 〖FL