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The net photosynthetic rate of ‘Seolhyang’ strawberry plants was measured daily for 7 days after treatment at three UV illumination dosages (0, 9.8, and 29.5 kJ·m^(-2)). The net photosynthetic rates of the strawberry plants with 9.8 and 29.5 kJ·m^(-2) UV light illumination decreased by 20.2 and 61.4%, respectively, at 7 days after UV light treatments. UV treatments with two illumination dosages (7.9 and 15.7 kJ·m^(-2)) altered the phenolic compounds contents during the cultivation period when compared to those in the control fruits. The anthocyanin content with 7.9 kJ·m^(-2) UV light illumination of ‘Seolhyang’ increased by 18.7% compared with those in control fruits at the 11 DAT. However, the anthocyanin content of ‘Maehyang’ was not significantly different among treatments during experiment period. The highest level of ellagic acid was found with 7.9 kJ·m^(-2) UV light illumination in both cultivars at the 11 DAT. Our results showed that strawberries illuminated with UV light during cultivation period had higher bioactive compounds contents than control fruits. These results suggest that UV light treatments may be a useful non-chemical way of promoting strawberry fruits quality.