Abstract: Effects of high temperature on microsporegenesis pollen development of‘Hongdeng’ sweet cherry was studied by microscopic observation. The results showed that stamens of sweet cherry were sensitive to high temperature stress during sprouting time and were more likely to be damaged in earlier stage. More abnormal tetrads generated after 4 hours of 35 ℃ treatment during meiosis，which was 14 times of the control. The microspores began to degenerate in the following time and the remaining pollens were not able to germinate. The development of spores were promoted by 4 hours of 35 ℃ treatment during karyokinesis both in mononuclear microspore stage and mononuclear microspore stage. However，some microspores disappeared due to the disability of nutrition supplying caused by the disorganization of tapetal layer and middle layer. More anthers were found turning brown，and shriveling，with low gemination rates，during florescence after 35 ℃ treatment.

Key words: sweet cherry, pollen, anther, high temperature, meiosis