Relying upon the various bronze vessels of Marquis Bao of the Zeng state and those of the Zeng Marquis that have been previously unearthed, the present essay is intended to outline the development of the bronze vessels of the Zeng state marquises during the period of the Zhou dynasty. Three aspects of significance may be observed. First, the combined form of the Zeng State bronze vessels dating from the early Spring and Autumn period inherited the characteristics of those dating from late Western Zhou times; the former are very similar to the bronze vessels of central China. Second, it may be assumed that the capital of the Zeng state remained in Suizhou throughout the early to late Spring and Autumn period. Third, various evidence supports a theory that the state of Zeng was the largest feudal state in the Suizhou region, and that the state of Zeng is the same as the state of Sui in written records. This essay also introduces two sets of vessels: (1) the newly discovered Zeng Zhong Yi gui pot with a square base; and (2) the two basin-shaped gui pots with sharp nipple cast patterns, which were unearthed from tomb 46 of the Zeng State graveyard in Yejiashan. The discovery of these utterly unique bronze gui vessels in graveyards of the Zeng state illustrates the frequent contact between the Suizhou and Baoji regions during the early Western Zhou period, and also reveals the close relationship between the state of Zeng and the Western Zhou regime.