Abstract: The landslide of a large scale filled project on soft clay occurring during construction is described in this paper. Based on laboratory test and field data, the slope stability before and after the landslide is calculated, and the cause responsible for the landslide is analyzed. Finally a method for landslide correction is proposed, and the correction results are also given. All these provide useful data for design and construction of filled projects on soft clay, and can be used for reference of the other landslide correction.