Abstract：The creep curve of rock and soil mass is an important way to describe slope deformation. Three stages of the time-displacement curves are regarded as the basic standard of landslide time determination. Many forecast methods are put forward according to the standard. Results of landslide displacement curve reveal that the shape of creep curve is very similar to that of part of normal distribution curve. The method and corresponding models are firstly presented to fit observation data of creep with renovated normal distribution curve. In view of the fuzzy and random characteristics of the rock and soil engineering，the fuzzy optimization theory is applied to the weight determination in the model calculation；and the weight determination model is given. The model is fitted to all stages of creep curve；so it is promising to realize the whole stage forecast of landslide. The prediction result shows that the proposed method is applicable.
