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In order to study the thermal stability Poinsettia, select the "velvet" and the "prestige" two varieties seedling heat stress experiments. 45 ° C in the climatic chamber, handling 0, respectively s. days sampling relative conductivity of leaves, malondialdehyde (MDA) and superoxide dismutase (SOD), peroxidase (POD), Catalase (CAT) and ascorbate peroxidase (APX) activity, O2-production rate. H2O2 content. The experimental results show that at high temperature stress, velvet and prestige in two days, similar performance, membrane permeability have increased but are not obvious, after a sharp increase. MDA first rose and then dropped the next day to rise substantially. Antioxidant enzyme activities (SOD, CAT and POD) coordination between changes to scavenging of reactive oxygen species, ROS maintain metabolic balance, the protection membrane structure. Two varieties of SOD, CAT, APX in experiments performance of the response is very different, This might be related to their activity. O2-production rate, H2O2 content, there are also great differences. But overall data can still see that the prestige of the thermal strong in velvet.