Abstract: The red light and blue light（white light as control） were used to treat purple lettuce（Lactvca sativa）,purple komatsuna（Raphanus sativus） and purple cabbage（Brassica oleraceavar）,5-dinitrosalicylic acid method and iodometric method were used to determine the changes of photosynthetic pigment content and nutritional quality indexes of three kinds of vegetables under different light qualities, in order to provide reference for light quality conditions of different kinds of vegetables during seedling raising.The results showed that the three vegetables differed in their adaptability to different light qualities, red and blue light promoted seed germination of purple cabbage compared with white light, and the effect of red light was better; red light promoted radical, hypocotyl length, leaf length and petiole length of the three vegetables, while red light increased chlorophylla, total soluble sugars and starch content of purple lettuce and purple cabbage, but inhibited vitamin C synthesis.The blue light had the promotion of carotenoid and vitamin C synthesis in the three vegetables.Therefore, different light conditions could be used depending on the plant species to improve the growth characteristics of the vegetables or to improve their product quality.