Abstract: Through systematic combing the research results of the “Suo” structures, combined with my own statistical analysis, we believe that the evolution of “Suo” structures in the pre Qin period is as follows: The “Suo” structure is formed in the Spring and Autumn Period, and become more complex in the Warring States Period; “Suo+ monosyllabic verb” appears earliest and has the highest proportion in the “Suo” structures, followed by “Suo+ verb phrase” and “Suo+ preposition + others”; “Suo+ preposition + others” has gone through a evolution process from scratch, and the prepositions after the “Suo” character increasingly abundant species, of which the preposition “Yi” is used most frequently.

Key words: “Suo” structure, Pre Qin Period, Development and Evolution