Abstract: The traditional slope monitoring method is mainly used to monitor the horizontal displacement of the local area, however, the stress and strain index can reflect the real state of the slope more visually.Based on the principles of distributed fiber optic strain sensing monitoring technology, a numerical slope-foundation model was developed, and by using the horizontal strain index, studies of the deformation and the failure process of the model were carried out.The analysis results show that the horizontal strain index can reflect the deformation process of the slope and it can predict the actual slip surface better in the loading process, comparing with the horizontal displacement index.And there is a good logarithmic fit between the maximum horizontal strain and the stability factor in the 6 horizontal measuring lines distributed in the slope.It is suggested that the best monitoring area is the middle of the slope by comparison.In addition, by introducing the horizontal strain acceleration index (HSA), the relationships between the slope stability coefficient and HSA were captured to predict the stability degradation trend of the slope-foundation, after which the process control could be realized.