In terms of the study of influence of wind field on cyanobacteria, presently there are many studies on shallow lakes such as Lake Taihu, Lake Dianchi and Lake Chaohu in China, while the research on Lake Poyang focuses on cyanobacteria communities and their relationship with nutrients. In recent years, as an important river-linked lake in the Yangtze River Basin, Lake Poyang has been a state of mild eutrophication, cyanobacteria blooms have appeared in local reservoir bays, and how the wind field affects the surface cyanobacteria density is a question worth exploring. In 2019-2021, 13-49 sampling points were arranged in Lake Poyang, data on surface water quality, algae, flow and wind field were collected during the wet, normal and dry seasons. The influence of the wind field on the density of cyanobacteria on the surface layer during the wet season of Lake Poyang was analyzed. The results showed that, in 2019-2021, the wind speed during the wet season of Lake Poyang showed a significant positive correlation with the surface cyanobacteria, and the full mixing of the water body by the wind field and the aeolian flow were the one of the reason for promoting the growth of cyanobacteria. In areas with high flow velocity (>0.05 m/s), regardless of whether the wind speed was higher or lower than the critical wind speed (3-4 m/s), the spatial distribution of surface cyanobacteria density was more affected by the flow field. In the area with slow flow velocity (<0.05 m/s), when the wind speed was below the critical wind speed, the spatial distribution of surface cyanobacteria density is more affected by the wind field. In 2019-2021, the density of cyanobacteria in the flood period of Lake Poyang exceeded the threshold of bloom outbreaks, but under the combined action of high wind speed and high flow rate, a large area of cyanobacteria blooms could not occur, and only small areas of cyanobacteria blooms could occur in the inner bay and local area with slow flow velocity (<0.05 m/s) and suitable wind speed (<3-4 m/s). When the water body of Lake Poyang is under the top action of the Yangtze River, and the flow rate and wind speed is slow, the probability of large-scale cyanobacteria blooms will increase greatly.