An early warning monitoring method for landslides based on quasi-distributed fiber optic stress sensing is presented in this paper. The principle of quasi-distributed fiber optic stress sensing and the monitoring method for landslides with the internal stress of landslides are described. According to the characteristics of the soil mass and the changes of stress which was detected by the system, through some applications of specific mathematical models, the movement can be predicted. With stress measuring range 0~15MPa, spatial resolution 2m, measuring distance 1km, the quasi-distributed fiber optic stress sensor and the warning monitoring system are designed. This landslide monitoring method has outstanding performance characteristics; for example, high-sensitivity, high spatial resolution, quasi-distributed measuring, easy networking to monitor landslides in the area and very good adaptability in project.