Abstract: The morphological, physiological and biochemical indices of heat resistance in kiwifruit were studied in the paper.The results show that cultivars with stronger heat resistance have greater leaf thickness, palisade parenchyma thickness,palisade parenchyma/sponge parenchyma ratio and stomata density compared with cultivars of weaker heat resistance; The difference of heat resistance among cultivars can be measured by the critical temperature values; Cultivars with stronger heat resistance have higher relative accumulation percentage of leaf free proline content under heat stress than cultivars of weaker heat resistance; There is no close relations between heat resis tance and leaf peroxidase activity.