公路沿线泥石流灾害危险性区划可以明确不同地区灾害防治的轻重缓急和设防标准,为宏观政策的制定提供理论基础。从地形地貌、降水、岩土和植被4方面开展公路沿线泥石流灾害危险源辨识,根据潜在公路沿线泥石流灾害调查结果,采用遗传算法提取危险性评价指标,通过云模型改进AHP算法计算各指标权重,基于Arc GIS软件绘制各评价指标的基础图件并进行公路沿线泥石流灾害危险性空间分析,以公路沿线泥石流灾害危险度为主导依据,编制中国公路沿线泥石流灾害危险性区划方案。结果表明:中国公路沿线泥石流灾害危险度为1.000~7.900,危险度较高的区域为浙闽东南山区、台湾山区、昆仑山脉、天山山脉、太行山、黄土高原、横断山脉和青藏高原东部等;中国划分为低度危险、中度危险、重度危险和极重度危险4个等级、14个危险区,其中极重危险区为黄土高原—秦巴山区、武夷山—台湾山区、川滇山区和天山—昆仑山区。 Debris flow hazards along the highway zoning can clear priorities and disaster prevention and control in different areas of disasters and standards for the formulation of macroeconomic policy to provide a theoretical basis. According to the survey results of debris flow hazards along the potential highway, the genetic algorithm is used to extract the risk assessment index, and the AHP algorithm is used to calculate the weight of each index, which is based on the landform, precipitation, soil and vegetation. Based on the ArcGIS software, draw the basic map of each evaluation index, analyze the risk of debris flow hazards along the highway, take the risk of debris flow hazards along the highway as the main guideline, and draw up the program of the hazard zonation of debris flow hazards along the highway in China. The results show that the risk of debris flow hazards along the highway in China is 1.000-7.900, and the areas with high risk are the mountainous areas of southeast Fujian, Fujian, Taiwan, Kunlun Mountains, Tianshan Mountains, Taihang Mountains, Loess Plateau, Hengduan Mountains and eastern Qinghai-Tibet Plateau. Divided into four categories of low-level danger, medium-risk, high-risk and high-risk, 14 dangerous areas, of which the most dangerous areas are the Loess Plateau - Qinba Mountains, Wuyishan - Taiwan Mountains, Sichuan and Yunnan Mountains and Tianshan - Kunlun Mountain.