With the intensive development of urban land resources, in order to alleviate the urban traffic pressure, urban subsidence tunnel is more and more used in road intersection or under-crossing of main road under the background of restriction of urban ground upward development and consideration of surrounding environmental landscape requirements. Based on the design experience of open-cut tunnels in Guangdong in recent years, the author of this paper considers and studies the anti-floating design of open-cut tunnels, which provides a useful reference for other similar engineering practices.