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This study was conducted to investigate the effects of night illumination on the growth and yield ofsesame(Sesamum indicum) and perilla(Perilla frutescens). Stem length and height of the first pod insesame increased, whereas number of branch was reduced and flowering date and maturing datedelayed as light intensity of night illumination increased. Number of capsules per plant, ripening ratioand seed yield of sesame were reduced as light intensity of night illumination increased. Yieldreduction was greater in Ahnsankkae than in Sodunkae. Number of nodes increased under nightillumination in perilla. Two test cultivars showed reduction in number of branch at 6~10 Lx(22 mWm-2) intensity of night illumination, even though there was a variation between cultivars. Perilla wassensitive to night illumination for flowering and ripening. Flowering date was delayed by 21 to 28 daysat 6~10 Lx intensity of night illumination. Number of flower clusters, number of seeds per flowercluster, and 1,000-seed weight in perilla were significantly reduced and seed yield was reduced by 89to 98% at 6~10 Lx intensity of night illumination.