Abstract: On the basis of fractal theory,the spatial fractal dimensions of landslides and water system in Zhangmu area are claculated by box-counting method in Tibet.The variation features of fractal dimensions are analysed.The results shows that the lower fractal dimension phenomena of different amplitude exist before high activity of a landslide.The activity climax period.The extent of landslides activities is different in a landslide area,where the variation of fractal dimensions of water system is evidently different in different measure scales.The authors also discuss the significance of fractal dimensions in prediction of landslides.