Abstract: The continuous deformation of high expansive soil slopes of the South-to-North Water Diversion Project directly affects the operation safety of the water conveyance channels, so it is imperative to carry out danger removal and reinforcement measures. The umbrella-type anchor technology is a new type of prestressed anchor technology that is quick and efficient. Based on the embankment reinforcement project of high channel slope of expansive soils in Xichuan section of the Middle Route of South-to-North Water Diversion Project, the in stability situations and reasons of canal slopes are analyzed, and the deformation location of sliding surface and the sliding direction are predicted. The reinforcemetn design and construction technology for slope disasters are introduced, and the slope stability is monitored after the reinforcement. The engineering practice shows that the umbrella-type anchor technology can strengthen the channel slopes quickly, and the reinforcement effects are good. After the comprehensive analysis of the monitoring data and construction time, the technical advantage of the umbrella-type anchor technology in the reinforcement of high expensive soil slopes is verified.