Abstract: High temperature has already become a noticeable environmental factor for crop production, while plant pollen was the most sensitive organ to high tem perature stress. In this paper, the cytological, physiological, and molecular bi ological studies on the high temperature stress on crop pollen were reviewed, a imed to provide ideas for maintaining high productive ability of crops under hig h temperature stress. The cytological effects of high temperature on crop polle n included the changes of arrangement patterns of rough endoplasmic reticulum in tapetum cells, the irregularity of vascular bundle sheath cells in connective t issue, and the reduction of vesicle production by dictyosomes of pollen tube, etc.; physiological effects involved the incapacity of timely recovery of Ca2+ homeostasis, the changes of growth regulators contents, and the slowing down of car bohydrate metabolism, etc.; and molecular biological effects manifested in the insufficient induction of heat shock proteins and the inhibition of oth er functional genes for pollen development, etc.

Key words: Qingyuan County of Liaoning, multiple objective grey situation decision, spatial optimum allocation, forest ecosystem.