Abstract：After the law of settlement change analysis of soft soil treated by vacuum preloading method，it is found that the law is similar to that of Gompertz Growth Curve used in socioeconomic prediction. Based on practical engineering examples，the values of parameters of Gompertz Growth Curve by three-segment estimation method are achieved，and the Gompertz Growth Curve Model is established to analyze the settlement data of soft soil treated by vacuum preloading method and compared with Hyperbolic Model and Index Curve Model. The analytical results of engineering practice indicate that the effect of fitting curves by using this method is good and this method is reasonable to analyze the law of settlement change of soft soil treated by vacuum preloading method. It also can be used for predicting soft soil settlement，calculating post-construction settlement and unloading time decision. Compared with Hyperbolic Model and Index Curve Model，Gompertz Growth Curve Model has good adaptability and precision in trend forecast. Last，some problems such as continuing evacuation，three equal segment measured data and elastic-plastic deformation of soil，are pointed out during application of Gompertz Growth Curve Model.
