"Yu Ding" and "gourd ladle" show that the largest organizational unit of the Western Zhou army is the division. But "Zhou Li-Xiaguan" said, "Anyone who builds an army is an army of 2,500 people, including Wang Liujun, the three armies of a big country, the second army of a small country, and the second army of a small country. There are 500 teachers among 2000 people, and Shi Shuai is a doctor in China. 500 people are tourists, and all tourists are doctors. Everyone is a pawn, and every pawn is a staff sergeant. Twenty-five people are two, and Sima is a sergeant. Five people are friends and each has his own strengths. " There is no such record in ancient books such as bronze inscriptions, so it can be inferred that there may be no military organizational system in the Western Zhou Dynasty, and it is difficult to have such a formal organizational system. There are also many contradictions in the literature, but the number of troops directly under the emperor of Zhou is definitely more than that of a single vassal state, which is certain. Moreover, the vassals who were enfeoffed were mainly masters and heroes, and they also contained each other.