| As one of the key regions in China with frequent and highly influential droughts, the Loess Plateau has a particularly significant negative impact on the ecological environment and people's lives. This study is based on the CRITIC (Criteria Importance Through Intercultural Correlation) weighting method, which comprehensively considers meteorological and agricultural drought indicators, aiming to construct a comprehensive drought index (TVSS). Based on this, trend analysis and trip theory are combined to study and analyze the drought change trend and drought events in the Loess Plateau region. The results indicate that TVSS constructed based on CRITIC weighting method at different time scales have been confirmed to be reliable through correlation analysis, and a total of 28 comprehensive drought events have been recorded in the past 23 years. Analyzing the characteristics of drought,? it was found that the duration, peak intensity, and total intensity of drought all showed a decreasing trend; On the whole, the drought frequency of the Loess Plateau was higher in the west than in the east and higher in the north than in the south, and the proportion of regional drought and local drought was 19.6% and 18.5%, respectively, while the frequency of regional drought and some regional drought was relatively low, 7.6% and 8.7%, respectively. From 2000 to 2022, the TVSS index of the Loess Plateau showed an upward trend, with the monthly change rate of 0.0004/10a, the seasonal change rate of 0.3/10a except winter, and the annual change rate of 0.447/10a, indicating that the drought situation in the region is gradually developing towards a humidifying trend. |