With the gradual improvement of the infrastructure system in the trunk stream of the Yangtze River channel,the problem of the maintenance of waterway regulation buildings is becoming more and more prominent.Based on the fundamental maintenance data of the Yangtze River channel,we calculate and analyze Thiel index,Moran index and standard distance to study the spatial-temporal characteristics of the technical status of channel regulation buildings.The results show that the number of channel regulation buildings and the technical condition grade is increasing by years,and 2019 is the turning point of the Thiel index.The maintenance of channel regulation buildings such as spur dike and beach protection belt need to be focused on.The distribution of the technical condition of channel regulation buildings in the trunk stream of the Yangtze River channel presents a significant clustering feature.In the upper reaches,the technical status of channel regulation buildings is more centralized compared to that of the middle and lower reaches.