Abstract: A slope model was conducted in the laboratory and a special strain sensing cable was buried in the soil mass. The sensing cable strain at different position of the slope model was measured by the pulse-prepump Brillouin optical time-domain analysis (PPP-BOTDA) technology during the loading and cut the slope. Then the test processing was simulated by the finite element analysis software Geo-studio. The measurement data under the loading have been analyzed to discuss the co-deformation between the sensing cable and the soil mass. The results show that the co-deformation was affected by the confining pressure significantly. The measurement data of the sensing cable during cut slope showed that there was strain concentration area in the soil mass. When the slope failed, the position of the sliding surface was consistent with the strain anomaly area of the sensing cable. The results provide a guiding to evaluate slope stability and perform early warning of landslides.