Laotan sauerkraut is clean now. After the exposure of CCTV, the competent departments and enterprises carried out rectification and production, sales and management in strict accordance with the Food Safety Production Law. Laotan pickled vegetable, called fermented vegetable in ancient times, refers to the pickled vegetable which is made of fresh mustard as the main raw material, with or without salt, with or without auxiliary materials such as salt and liquor, and fermented in a clean pottery jar for more than 10 days. Laotan pickled cabbage has a long history and is a famous dish in Zhou Li. The book Qi Yao Min in the Northern Wei Dynasty was introduced in detail.