The size of Spring Festival couplets should be coordinated with their own portals. It is best to paste Spring Festival couplets with a width of/kloc-0.5 to 20 cm on the portal of residents' homes, and it is best for merchants to paste Spring Festival couplets with a width of 20 to 30 cm according to the width of the portal, which is harmonious and generous. As for the gates of some tall buildings, if the Spring Festival couplets are posted, the width of the Spring Festival couplets should not exceed 40 cm. Spring Festival couplets, also known as couplets, door couplets, spring stickers and couplets, are unique literary forms in China. They are usually posted on both sides of the house during the Spring Festival to express good wishes for the coming year and expectations for life. Spring Festival couplets originated in ancient Fu Tao. The legendary brothers Shen Tu and Lei Yu can catch ghosts to ward off evil spirits, so people carve their names on peach trees and hang them on doors to ward off evil spirits. Later, this custom gradually evolved into writing auspicious words on red paper and sticking them on doors, forming today's Spring Festival couplets. The content of Spring Festival couplets usually contains positive themes such as auspiciousness, happiness, well-being and prosperity, which reflects people's love for life and yearning for the future. There are various forms of Spring Festival couplets, including horizontal couplets, vertical couplets, and simple sentences as embellishments. In the traditional culture of China, Spring Festival couplets are not only a form of literature and art, but also a form of expression of folk culture. It carries rich historical information and profound cultural connotation, and is the crystallization of Chinese wisdom and aesthetic taste. During the Spring Festival, every household will carefully select or make Spring Festival couplets to welcome the arrival of the new year and pray for good luck in the new year.