According to China's traditional concept, the meaning of the word "four" has many auspicious meanings, such as "four reds and four joys", "four parties are guests", "four generations living under one roof", "four longevity" and "four seasons gathering wealth". Therefore, the name of "four or four seats" naturally makes people fully associate, enriching the numerical meaning and social concept of dishes and utensils. As far as mathematics is concerned, the "four four" rule is just suitable for eight people to eat, one less is not enough, and one more is more than enough.

For the banquet of important guests, four tables, four dried fruits, four fresh fruits, four candied fruits and four snacks are often used as "pre-banquet" utensils, which not only shows respect for the guests, but also meets the sanitary requirements of not making the host and guest drink on an empty stomach. Two empty seats are reserved between the seats for the toasts to take part in the toast at any time, which is called "empty seats" (one less is "empty seats" and the other is "corner seats") to show the solemnity of hospitality and thoroughness of etiquette.

"Four or four seats" is not only a simple catering culture, but also accompanied by the continuous progress and development of the times. On the basis of blending into local customs, rich contents such as wine culture, filial piety culture, etiquette culture, wedding culture, apprentice culture and cooking culture are derived. The restraint of traditional etiquette, such as "respecting the old and treating the humble", "orderly host and guest", "making a toast in advance" and "leaving the table", as well as the on-site reconciliation of diners' poems and thanks, make "four or four seats" less vulgar and more elegant in the catering process in Le Yan.