This thesis taked Korla fragrant pear as the material,the effect of high temperature and drought on photosynthetic characteristics in Kor la fragrant pear were measured with 3 different treatments which were included high temperature and drought, watered, sprayed at 36℃ high temperature conditions.The results are as follows:1. The variation curve of Korla fragrant pear net photosynthetic rate presented double-apex with a phenomenon of photosynthetic “noon breaking” and net photosynthetic rate of each time p...