Yunnan is one of the provinces with the most serious landfall-landside disasters in China. There are 5,000 landslides in this area, 200 ones of them are disastrous. In general, they are in middle or small scales and few landslide bodies are over 1 million m³. Most of the landslides are revival ancient landslides, but few are new-bron and in an active term. They are tending to increase year by year. The preventive measures are: to research the evolution laws of landslide, to stress forecast and prediction, to organize evacuation and dispersion, to build forest and dredge the waterways, to control the typical landfall-landslides in a comprehensive way, and to get effects and extend the experiences.