Abstract：Analyses on local and global stability，slip displacements and catastrophic property of landslide of Shenzhen reservoir slope are given，and effect of groundwater and soil weakening property by water on slope stability is emphatically studied. Catastrophe of landslide of slope is analyzed by the use of catastrophic theory model. The calculated results of stability and displacements indicate that unstability of slope is mainly caused by groundwater affection and soil weakening by water，and catastrophic analysis also indicates that slip displacements increase sharply and slope unstability arises suddenly when shear strength of soil is reduced to certain value due to soil weakening. The theoretical results are in good agreement with those of in-situ test and are able to provide scientific basis for slope protection.
