Abstract: In order to explore the cause of the turbidity of Nanhu Lake, the spatial and temporal distribution characteristics, composition and variation rules of suspended solids in Nanhu Lake were analyzed according to the detailed field investigation in 2018-2019, and the influencing factors of suspended solids and their effects on water environment were discussed. The results showed that the total suspended solids (TSS) content in the water of Nanhu Lake was obviously higher than those of some other lakes in China, ranging from 29.20 to 75.20 mg/L, with the mean value of 38.95 mg/L, and inorganic suspension was mainly in the water, the proportion of which ranged from 55.42% to 79.25%, with the mean value of 66.80%. At the same time, the median particle size of suspended solids was mainly small particles of 0-10 μm, and the proportion was 45.24%-83.73%, with the mean value 58.94%, which was significantly higher than those of the surrounding waters. Correlation analysis showed that the concentration of TSS in the water was significantly positively correlated with total nitrogen and total phosphorus concentrations, indicating that suspended matter, as a carrier of nutrient salts, had a greater impact on the water quality of Nanhu Lake.