Abstract: The article studied the relationships between the water-temperature factors and natio nal wild conservative plants in Chongqing,and obtained the water-temperature range of the distribution of these plant species.According to warmth index,coldness index and moisture index,these national wild conservative plants were analyzed by the CLUSTER classification,the results showed that these plant species could be divided into five types:(1)Megathermal humid type,(2)Mega-mesothermal humid type,(3)Mesothermal humid type,(4)Micro-mesothermal humid type,(5)Microthermal humid type.Meanwhile,the study implied that water and temperature conditions were fit to the growth of these species in Chongqing,but present conditions of water and temperature are not the main reasons why rare being plants were endangered,human impacts were the major factors responsible for the endangered status of these species.