Abstract: Pak-choi‘Haiqing’is a new hybrid with high quality and cold tolerance. Its plant is erect with middle short compact plant type and vigorous growth, with glossy dark green outer leaves and wide green petiole. It could be harvested at 25–40 days after seeding and its average yield could be up to 40 500 kg • hm-2 at 40 days after seeding. It showed cold tolerance，high viral disease and downy mildew disease resistance. It is suitable for cultivation in Shanghai and other areas with similar ecological conditions in middle and lower reaches of the Yangtze River in autumn and winter.