Abstract: The incubation of drifting fish eggs is synchronized with their migration in water, and the success of the incubation also closely related to the fish eggs’ movement behavior in water. To study the settling characteristics of drifting fish eggs in static water, five sampling sites were chosen for drifting fish eggs collection in the Yibin-Fengdu river steam of the Yangtze River main stream from June 16 to July 18, 2021. A total of 848 drifting fish eggs were collected and 399 of them were randomly selected for their hydrostatic settling studied. The results show that: (1) the diameter of the drifting fish eggs is 4.0-8.0 mm, and 88% of the fish eggs’ diameter is 5.0-7.0 mm. (2) The density of the drifting eggs is 1.001 2-1.003 4 g/cm3, and 78.9% of the fish eggs’ density is 1.002 2-1.003 2 g/cm3. (3) The terminal settling velocity of those drifting eggs is 3.0-12.0 mm/s (with average velocity was 7.16 mm/s). The following reasons are the main factors that affect the terminal settling velocity of the drifting fish eggs: movement of fish eggs in static water will lead to slight water turbulence behind the eggs, irregular autonomous movement of fish egg embryo, fish egg membrane deformation and changes in density due to compression by water. The hydrostatic settling coefficient (k=0.609), which is related to disturbance resistance, was obtained by combining the hydrostatic settling equation and experimental data with the force analysis of drifting fish eggs in static water in the upper Yibin-Fengdu river stream of the Yangtze River.