利用2017—2020年冬春季（10月至翌年4月）雅鲁藏布江中游的15个气象站逐小时最低能见度数据，基于转移熵方法构建了沙尘传输矩阵，研究雅鲁藏布江中游沙尘天气的日变化特征和空间交互影响过程。结果表明：雅鲁藏布江中游沙尘天气主要出现在山南和日喀则两大宽谷沙源区，具有3~4 h持续性，并具有雅鲁藏布江中游南部白天单峰型、北部上半夜和上午双峰型结构的空间差异性。沙尘在空间上既有跨行政区传输，又在区内相互影响，形成复杂的空间交互过程。区域传输的空间差异主要受地理位置、沙尘源分布和风向风速的影响。两大宽谷和高海拔区作为沙源区不仅显著影响本区的自身和区内传输贡献，而且在西风带作用下对区外的传输贡献也很强，是沙尘传输空间网中重要节点，也是沙尘治理关键区。

The middle reaches of Yarlung Zangbo River are the most serious area of dust disaster on the Tibetan Plateau. Using the hourly minimum visibility data of 15 meteorological stations in the middle reaches of the Yarlung Zangbo River from October to April in 2017-2020， a dust transmission matrix was constructed based on the transfer entropy method to study the diurnal variation characteristics and spatial interaction effects of dust weather. The results show that the dust weather mainly occurs in the two wide valley sand source areas of Shannan and Shigaze， with 3-4 h duration and a spatial difference between the single-peak structure with the peak during the day in the south of the Yarlung Zangbo River and the double-peak structure with the peak in the first half of the night in the north. The transfer entropy method can objectively and quantitatively describe the spatial structure of dust weather transmission in the region. Dust has cross-administrative region transmission in space， also influences each other in the region， forming complex spatial interaction influence. The spatial difference of regional transmission is mainly affected by site geography， dust source layout， wind direction and wind speed， the two wide valley and north high altitude area not only significantly affects the site's own and intra-regional transmission contributions， but also contributed very strong outside dust transmission under the action of westerlies. The two wide valleys and high altitude area are not only important nodes in the dust transmission space network， but also key areas of dust control.