Couplets, also known as couplets, couplets, door dangs, etc., are an applied style with a long history and appeal to both refined and popular tastes, and are unique literary treasures of China people. It requires equal words, conciseness, neatness, uniformity and coordination, and it is a unique form of literary expression.

Couplets are composed of three parts: horizontal approval, upper couplet and lower couplet, which are widely used in Chinese New Year, famous mountains and rivers, home, wedding, opening and other occasions. Generally speaking, the knowledge and rules of couplets are mainly aimed at the upper and lower couplets.

Couplets originated in Fu Tao, began in the Five Dynasties, flourished in the Ming and Qing Dynasties, and have a history of more than 1000 years. As early as before the Qin and Han Dynasties, in the Central Plains of China, there was a custom of hanging peach symbols during the Spring Festival. Fu Tao, with the names of "Shen Tu" and "Lei Yu" Er Shen engraved on two pieces of mahogany, hangs on both sides of the door to ward off evil spirits and protect the house.