Monitoring data show that the soil landslide or the rock landslide with the aging deformation characteristics

often have creep characteristics; namely it generally undergoes three stages from the beginning to the failure: the initial deformation

the constant speed deformation and the accelerated deformation. Based on the characteristics of typical accumulation displacement-time curve of the landslide

a method has been proposed to determine the different deformation stages of each point of the landslide mass. Taking the displacement speed ratio (DSR) as a general indicator

when DSR 0-2 means the constant speed deformation

and greater than 2 means the accelerated deformation. Based on some typical landslide cases

a displacement over-acceleration criterion has been established to determine the different deformation stages of each point of the sliding mass: DSR=2-6 means the initial acceleration stage; DSR=6-8 means the intermediate acceleration stage; DSR greater than 8 means the pre-slippery stage. A geographic information system (GIS) based method of DSR has been proposed for the spatial stability evaluation of landslides. As an example

the method has been used to determine the spatial deformation state of Jinpingzi landslide; the result verifies its feasibility and reasonability.