Xiaolin village is located in Kaohsiung County, Taiwan. During typhoon Morakot, mass movement of over 25 million cubic meters of earth buried and killed more than 100 houses and 400 people. By comparing topographical changes, geological conditions, rainfall records, river water levels and ground vibrations, the conclusion shows the record-breaking rainfall and the fragile geological formation were the major causes. The disaster process analysis can provide important criterion for predicting and preventing similar large scale disasters.