As one of the important water resource strategic areas in China

the surface water area changes in the Yangtze River Basin directly affect regional water supply stability and water security

thereby affecting regional water resource security. Based on Landsat series remote sensing images

this article extracts and statistically analyzes the water surface area of the Yangtze River Basin and its sub basins from 1987 to 2024

and explores the spatiotemporal and intra annual variation patterns. The results indicate that

on an annual scale

the increase in upstream water area dominates the growth of the entire watershed water area

while the shrinkage of water area in the middle and lower reaches is severe. From a monthly perspective

the seasonal variation pattern of water body area has undergone significant changes since 2000 compared to before2000. The amplitude of seasonal fluctuations has decreased

and the average monthly water body area in most sub basins has increased. The regions distributed along the middle and lower reaches of the Yangtze River have shown the opposite trend. Therefore

it is necessary to conduct long-term monitoring for different regions and strengthen the diversified scheduling and management of water resources. The results of this study can provide some reference for formulating reasonable regional water resources management strategies in the Yangtze River Basin.