「律詩」始於唐，而歷來文獻與研究學者們對於唐代「律詩定型」說，每每提出不同見解，大抵分爲以下諸說：（一）、「律詩定型」完成於「沈宋」之手。（二）在六朝齊、梁之「聲律說」基礎上，初唐時期，元兢提出「換頭術」後，使得「齊梁體」有對而無黏的形式，進一步發展完成律詩注重黏、對的形式。（三）「律詩定型」與科舉相關等。筆者則擬從詩歌發展史的角度，來檢討「律詩定型」之諸多成因，並實際分析沈、宋二人所言之「新體詩」，與齊梁體詩歌形式上之不同，進一步突顯與了解「律詩定型」之樣式，並提出「律詩定型」最爲客觀之時問點，以補強現今學者之成說。

"Lushi" begins in Tang. but always the literature with studies the scholars "Lushi to finalize" regarding the Tang Dynasty to say, often below proposed the different opinion, generally speaking divides into various said: (1) th, "Lushi finalizes" to complete in "the Shen Song" the hand. (2) in the Six Dynasties uneven, Liang it "the rules of tonal pattern said" in the foundation, initially the Tang time, after Yuan Jing proposed "trades a technique", enables "Qi the Liang body" to have to the form which not mounts, further develops completes Lushi pays great attention to mounts, to the form. (3) "Lushi finalizes" and the imperial civil service examination correlation and so on. The author draws up from the poetry history angle, examines "Lushi to finalize" many origins, and actual analyzes Shen, the Song two people says it "the new body poem". with Qi in the Liang body poetry form the difference, further suddenly reveals with understood "Lushi finalizes" the style, and proposed "Lushi finalizes" the most objective time spot, makes up the strong nowadays scholar to become said.