The slope has existed in the world for a long time. The geodisaster such as landslides, collapses and mudrock flow caused by instable slopes led great loss to people’s lives and properties. Thus, it is very important to monitor and treat the instable slopes. We reviewed the past and development of slope probing and treating technologies, and reconsidered problems and deficiencies of these technologies using philosophy principles. According to the reconsideration, we proposed monitoring and treating methods based on principles of environment foremost, people oriented and sustainable development.