Five-character poetry is an important poems form in Chinese Literature, which have five-character-four-sentences, six-sentences, eight-sentences, ten-sentences,twelve-sentences or even longer. Although the regulated verse form got into matured in Tang Dynasty,but it was brewing in the Southern Qi Liang.Start from Southern Song Dynasty,five-character poetry was gradually appeared into a large number,especially of the five-character-eight-sentences poetry.However, among the academia only focus on researching poetry rhythm and the antithesis,did not put efford into research the structure of five-character poem.This thesis focuses on this phenomenon,based on the number of five-character poems and the poems structure,try to research the process of five-character poems evolve into regulated verse.