Revision of starting point of time is needed when three-point method of settlement prediction is employed for staged loading of large-area preloading. Lack of settlement of early stage of construction is often encountered in engineering practices. The application of three-point method of settlement prediction is confined by such factors as whether it is suitable for staged loading or not, revision of zero point of time, situation of lack of settlement of early stage of construction. It is proven that three-point method is suitable for such conditions as staged loading and lack of settlement of early stage of construction. A more reasonable method of revision of zero point of time which is called equal settlement method is proposed. The result of study of the paper is proven reasonable by an example and project. The instantaneous settlement gotten by use of the present method of revision of zero point of time is usually error.