Abstract: The characteristics of water temperature distribution in Xiangxi Bay were studied by numerical simulation method after the Three Gorges Reservoir had been put into operation, the result is that, the Xiangxi Bay is the water body of seasonal temperature stratification, and the thermocline can be observed in the period of stratification, Furthermore, the impact of the water temperature distribution on the vertical transport of suspended solids was discussed. Through derivating the relation of water temperature and settling velocity, it is shown that the settling velocity is significantly affected by temperature, and under the conditions of weak hydrodynamic, the water temperature stratification makes the settling velocity of suspended solids is gradient distribution, then the suspended solids are enriched at the epilimnion, finally the concentration of materials will be stratified in vertical.
