the so-called "36 lines" refers to the trades of all walks of life, that is, the types of jobs in society. As the saying goes, "knock gongs to sell sugar, and do your own thing." About the industry, there have been 36 lines of records since the Tang Dynasty. In the Song Dynasty, Zhou Hui's Qingbo Magazine recorded meat shops, seafood shops, sauce shops, flowers and fruits shops, fresh fish shops, palace powder shops, ready-made clothes shops, medicine shops, tie shops, coffins shops, old shops, pottery shops, funeral shops, drum music shops, juggling shops, leather shops and so on.