Abstract: The morphological and physiological changes was researched with Scaevola albida ‘Mauve Clusters’ cutting seedlings as materials in order to explore the physiological response and adapting mechanism of Mauve Clusters under high temperature stress in this study. Results showed that high temperature had certain influence on the morphological characteristics of Mauve Clusters. With the temperature rised, injury indices increased gradually, and continuous high-temperature stress could make Mauve Clusters wither or even death. When relieving from stress, most plants could recover by themselves. With temperature rised and time prolonged, chlorophyll and carotenoid content were significantly reduced, while MDA and proline content appeared a tendency of slight increase-surging-slight reduction, at the same time, SOD activity rised slowly, and CAT activity firstly increased and then sharply deceased. At the temperature of 35℃ and 40℃, there were little effect on Mauve Clusters cutting seedlings growth. Under the temperature of 45℃ for 1 to 2 days, Mauve Clusters would suffer certain thermal damage, but could restore through self-regulation, when for 3 days, only 45% plants could live through self-regulation, and 55% plant withered or even dead. Under the environment of high temperature, there were significant correlations among injury indices, chlorophyll, MDA, proline, SOD and CAT, which suggested that these physiological indexes could regulate the high temperature damage, and those physiological indexes could be used as heat resistant identification index of Mauve Clusters.