There is a saying in Taoism that dragons, white tigers, suzaku and Xuanwu are the guardians of the gods. These four gods actually come from the worship of ancient stars. The ancients divided the stars on the ecliptic (the celestial region where the sun and the moon passed) into twenty-eight constellations, which were called "twenty-eight nights"; Later, the twenty-eight schools and the four elephants merged to form the saying of "twenty-eight schools" and "four elephants". Among them, there are seven places in the East-Jiao, Kang, Shi, Fang, Xin, Wei and Ji. The ancients imagined it as Jackie Chan. Because it is located in the east, according to the theory that the five elements of Yin and Yang are matched with five colors, the east is blue, so it is called "Qinglong". In this way, there are basalts in the north, white tigers in the west and suzaku in the south. Qinglong, Baihu, Suzaku and Xuanwu are collectively called the "four elephants", also known as the 44,000 gods. Generally, the gods of the four directions are often used in military ranks and ranks, and become the patron saint of marching and fighting. QuLi still said, "all right. The former Zhu bird (sparrow) is behind Xuanwu, and the left Qinglong is right white tiger, swinging on the ground. " Chen Man noted, "Yes, the army will leave. Suzaku, Xuanwu, Qinglong and Baihu are also well known. " He said, "Let all the flags fly, Dragon Flag Nine, Sparrow Seven, Tiger Six, Tortoise and Snake Four." In other words, its manifestation is to draw "four elephants" on the standard to show the front, back, left and right military formations, boost morale and achieve invincible goals. Notes on the Thirteen Classics? The Book of Rites Quli said: "If birds fly, like the poison of turtles and snakes, dragons and tigers are excited, which is not comparable to these four things." It can be seen that its role is great.