Lake Poyang is the largest freshwater lake in China, whose water quality is easily affected by sand dredging activities, and it is difficult to conduct comprehensive on-site supervision on the lake. However, the concentration of suspended sediment in nearby water will be changed when the sand dredgers are working, the above information which can be detected by remote sensing technology provides ideas for solving this problem. In this study, we use 133 GF-1 WFV data from 2013 to 2020 to monitor the sand dredging activities in Lake Poyang and then summarize the spatial-temporal patterns of sand dredging activities in Lake Poyang. The results are as follows:1) Since 2013, the annual average number of sand dredgers detected in Lake Poyang has shown the trend of increasing first and then decreasing, which peaked at 9.85 per scene in 2016. After 2019, it sharply decreased to about 3, and the supervisory policy is the most important factor in this case; 2) The expansion trend of sand dredging from Lake Poyang to South Lake has been effectively curbed after 2016, and has remained at a very low level since 2018; 3) Sporadic sand dredging operations can still be detected near Songmenshan Island, Xinzi County and Bijia Mountain even after the total ban on sand dredging in 2019. Our study not only evaluates the supervision effect of sand dredging activities in Lake Poyang in recent years but also provides a guideline for the supervision and effect evaluation of sand dredging activities in similar basins.