Stability analysis of the slope has been finished by global and local strength reduction method.For a homogeneous soil slope,calculation has been done firstly by global strength reduction method,so two reduction regions were adopted,one was greater plastic shear strain rate than 2.0e^-5 and the other was plastic flowing region,the sliding surfaces and the safety factors of slope were achieved by local strength reduction method,and the changing rule of the safety factors and the displacement of key points and the slip zone under different reduction scopes were analyzed.The results from the global strength reduction and the local strength reduction under the condition of the natural condition and steady seepage condition were compared with each other.The results showed that safety factors were almost the same,but the reduction region effected calculation results were significant,the stability safety factor by the reduction range of greater plastic shear strain rate than 2.0e^-5 was smaller.The results can provide reference for selecting the appropriate reduction regions with finite element strength reduction method.