The Chinese zodiac animals are rat, ox, tiger, rabbit, dragon, snake, horse, sheep, monkey, rooster, dog and pig. Its origins can be traced back to ancient Chinese folklore and divination. To analyze the formula of the Chinese zodiac, we first need to understand its origin and background. It is said that these zodiac signs are closely related to the Chinese calendar. Each zodiac sign represents a year, and the cycle takes 12 years to complete. This cycle is called the zodiac year. The formula is determined based on the years in the traditional Chinese calendar (lunar calendar). The formula is calculated based on the cycles of the Heavenly Stems and Earthly Branches, which are commonly used year expressions in the Chinese lunar calendar. There are ten characters in Tiangan ***, arranged in the order of "A, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui", while there are twelve characters in Earthly Branches ***, in the order of "Zi," Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai" are arranged in the order. By cyclically matching these two characters, 60 possible year combinations are formed, among which the arrangement and combination of 10 heavenly stems and 12 earthly branches correspond to 60 years. Through modulo operation, the Western calendar year can be converted into the corresponding celestial stems and earthly branches. According to this formula, the zodiac sign corresponding to a certain Western calendar year can be calculated. For example, 2019 is the Chinese year of Jihai, and the corresponding zodiac sign is the pig. This formula has been widely accepted and used to predict and interpret the fate of individuals and nations. To sum up, the formula for analyzing the Chinese zodiac belongs to Chinese cultural traditions and folk customs, and is determined based on the years in the traditional Chinese calendar. This formula converts the Western calendar year into the corresponding zodiac sign through the arrangement and combination of the heavenly stems and earthly branches. It is a unique cultural symbol of China, representing the wisdom and understanding of time of the Chinese people.