service. According to the inquiry of Haidilao official website, it is known that giving employees a red card is a representative service. Haidilao divides the whole process into four color cards: red card, Huang Ka, green card and blue card. Red card is service, Huang Ka is product, green card is food safety, and blue card is environmental sanitation. Haidilao, founded in 1994, is a direct catering brand hotpot restaurant mainly engaged in Sichuan style hotpot, which originated in jianyang city, Sichuan Province and was founded by Zhang Yong.