" Red sleeves add fragrance to the night while reading by candlelight " was an idiom that appeared in ancient Chinese literature. It described a person reading while lighting a candle at night. The origin of this idiom can be traced back to the Tang Dynasty poet Bai Juyi, who once wrote in "Farewell to the Ancient Grass":"The grass on the plain withers and thrives every year. The wildfire never ends, and the spring breeze blows, it grows again. The far-off fragrance encroaches on the ancient road, the clear green connecting the deserted city. And send the prince to the lush garden to bid farewell." Among them, the phrase " wild fire can't burn, spring wind blows, and it grows again " was quoted by later generations as " red sleeves add fragrance, candle reading at night ". This idiom means that a person who studies hard can feel the wisdom of books and grow even in the dark of the night. At the same time,"adding fragrance to the red sleeves" also symbolized the attraction of books to women. In ancient novels, women often liked to wear sachets to increase their fragrance when reading. Therefore, this idiom was often used to describe the degree of hard work and concentration of women in the study.