The influence of enhanced surface ultraviolet-B(UV-B) radiation on yield and quality of peanuts(Kainong 49) were simulated under cropland conditions.Three UV-B radiation treatments,namely control group,enhanced by 20% and enhanced by 40%,were set up based on UV-B level in sunlight.The result showed that UV-B radiation enhancement can reduce the peanut yield significantly,which was due to the reduction of pod number as well as hundred-grain weight.The influence of UV-B radiation enhancement on peanut quality was not significant in this study.When UV-B radiation was enhanced by 20%,fat content and protein content of the peanut were 51.02%,22.34%,respectively,and ratio of oleic acid to linoleic acid was 1.19,which was improved by 0.02 compared with the control group.When UV-B radiation was enhanced by 40%,fat content was 51.82%,protein content was 22.56%,and ratio of oleic acid to linoleic acid was 1.28,which was improved by 0.11 compared with the control group.The research result suggested that the enhanced UV-B radiation was not enough to have obvious impact on the peanut quality,which might be related to the UV-B radiation level,experiment design or peanut variety.