Instability accidents of temporary causeways on soft clay ground easily occur due to a variety of factors such as poor geological conditions, excessive rate of loading, etc., which affect the overall stability. This paper describes the repair measures taken in instability accidents of temporary causeways in a project. Based on the analysis of the bearing capacity of foundation and overall stability of causeway, this paper probes into the key facts of repair measures for instability causeway on soft clay ground. Some proposals are put forward on preventive and repair measures in instability accidents to provide reference for similar projects in the future.