Abstract:Soybean seedlings were subjected to two treatments of enhanced UV radiation simulating 3.6 % and 5.1% deletions in the ozone layer, respectively, in a field experiment. The significant decreases in plant height, leaf area, dry matter weight , water and chlorophyll content of the seedlings were observed. The inhabitation of growth of the plants depended on the time and density of UV radiation, showing a cumulative effect of UV radiation dose. The decrease in chl. b more than that in chl. a indicates that UV radiation damaged light-harvesting pigment substantially. A higher density of UV radiation lead smaller values of apparent photosynthetic rate, transpiration rate, water use efficiency (WUE) and stomata conductance of plants. The decrease in the shoot/root ratio was far less than that in the growth of the plants growing under supplemental UV radiation. The present work shows that the reduced growth and photosynthesis of the plants could avoid or lighten the further injury due to UV radiation, it benefits plant to adapt itself to en-chanced UV radiation.