The Taiwan area of mostly rugged mountains and special geological conditions induced catastrophic slope deformation by heavy rainfall and earthquakes. Unstable hillslopes present a significant problem especially to buildings because it affects the living safety. This article mainly discusses regions with buildings in a wide hillslope and proposes a set of hierarchical monitoring procedure. First, persistent scatters interferometric synthetic aperture radar (PS-InSAR) technology observes a wide region of displacement by SAR images, hence detects result of severe displacement regions as the interested areas. Furthermore, multi-rotors UAV (MUAV) captures high-resolution images calculation deformation in the interested areas, which evaluates the serious displacement as a high-risk region. Finally, the self-develop surveillance cameras monitoring system achieves real-time displacement and behavior in the high-risk regions. The study area is located in the campus. From the hierarchical monitoring procedure results, PS-InSAR investigation in the large region is found to be reliable and reasonable, which can provide MUAV flight an effective reference. Both the PS-InSAR and MUAV showed a ground maximum displacement of 30 mm yr-1 (LOS velocity) in the interested areas where ground displacement is higher than the building. The advantages of surveillance cameras include obtaining real-time displacement and providing clear surface erosion behavior. This study experimentally demonstrated and provided a reliable hierarchical monitoring procedure and deformation information of different scales through three remote-sensing techniques.