Abstract: Slope deformation characteristic's importance in stability prediction is obvious.The existent documents studied 2D or 3D model only,neglecting the respective effect of them,thus model selection is in no accordance with the problem.To this problem,Study-group used ADINA to establish 2D and 3D model and compare them to the worksite based on one loess slope reinforcement.The results show:these two models have a similar result on trend of slope deformation;the deformation prediction values of 3D is 30% to 100% higher than 2D,obtaining characteristic-oriented and quantity-oriented result respectively,3D model is more actual;the most weak positions predicted by simulation are in accordance with the worksite,it's practical.These conclusions provide references for model selection of loess slope deformation prediction and reinforcement.