The Western Zhou era is an important period for the development of Chinese language history. Chinese language in the Western Zhou era inherited most of the important grammatical features while it boost the development of new grammatical features. For word class, the emerge of conditional adjectives, disyllable adjectives, interrogative pronouns, and modal adverbs, gave birth to new types of word class. The numbers of coordinate increased and new types of conjunctions, such as disjunctives, causal conjunctions, consecutive conjunctions appeared. For the wordformation, the emerge of termination, such as “ruo(若),ru(如),ran（然）……” indicated the existence of adjoined wordformation；reiterative locutions（叠音词） alliterative words（双声联绵） and assonance words（叠韵联绵） indicated the emerge of phonic wordformation, also verbal composition compounding appeared. All three aspects can illustrate the trend for disyllable in Chinese language. For syntactic feature perspective, some significant structures such as “S(主)+ zhi（之）+V（谓）”, “attribute（定）+zhi（之）+zhong（中）”“V+zhe(者)” and “suo(所)+V” increased the number of structural auxiliary words. Meanwhile, the structure of “numberal(数)+quantifier（量）+n（名）” appeared. Furthermore, disposal construction（处置式） and causative construction（使动） can be used for transitive verbs and numeral words.

grammar history of early ancient Chinese; grammar of the Western Zhou Dynasty; wordbuilding of early ancient Chinese; syntax of early ancient Chinese