Abstract: The barometric buoy was designed and made by Administration of Wanfu sluice of Jiangsu province. It can be used to repair works under water at a depth 2. 8-7.5in. The equipment have many good features. It has characteristics of low costs easy movement and drainage,and it is used widely in practice. It has been successfully used in Gozhouba Project, Wanfu sluice and so on large-scale water conservancy projects,which has made high social and economic effects.