The south cross-island highway has promoted the developments of transportation, tourism, construction and land resources. Many Maintains, different altitudes and the interaction of trade wind and seasonal wind has caused abundant precipitation on the high way. Precipitation is the main factor of forest growth, but the composition of forest and the temperature are changing with different altitudes. Because of high variation of the topography, weak geology, vegetation growing on the steep slope, rocks and vegetation falls from the slope and results in bare slope. This study aims to investigate the factor causing disasters on the highway and discuss the correlation of plant clusters and the disasters.
