關於上古收舌韻尾韻部「脂真」、「微文」、「歌元」的陰陽對轉現象，過去學者的做法是構擬一套發音「部位相同」但發音「方法不同」的韻尾，用以解釋這種轉換關係。
　　但新構上古音學者白一平與沙加爾認為僅是同部位韻尾的轉換，並不符合押韻的條件，所以白一平、沙加爾認為這些表面上韻尾不同音位的「陰陽對轉」只是中古音系統的映射，並不是上古音系統的實際情況。
　　對於此問題，白一平—沙加爾的新構上古音系統接受了斯塔羅斯金所提出上古具有 *-r 韻尾的論點，所以在白一平—沙加爾的系統中，上古「脂真」、「微文」、「歌元」的陰陽對轉都被構擬為 *-Vr 形式，之所以中古音呈現為陰聲或陽聲，則是上古 *-r 韻尾後來的演變。
　　白一平—沙加爾的上古 *-r 韻尾構擬後來受到國外學者的支持，例如：Hill（2014）、List（2016），但王弘治（2019）則從漢語文獻證據出發，認為白一平—沙加爾的構擬在這些材料中並沒有得到正面支持。
　　關於以上問題，本文將從現存最早版本的安大簡《詩經》重新進行檢驗，探究白一平—沙加爾系統的韻尾構擬能否通過押韻條件的測試。然而就本文材料而言，白一平—沙加爾所構擬的上古 *-r 韻尾並沒有得到正面支持。

　　Early researchers reconstructed a series of lateral codas, which have the same place of articulation but a different manner of articulation. These codas can explain the alternation of lateral codas in Old Chinese phonology. However, Baxter and Sagart do not agree with the aforementioned reconstruction, because the rhyming principle is broken; namely sharing the same final and main vowel. The alternations of lateral codas are just a projection from the Middle Chinese scheme; it is not the reality of Old Chinese. Regarding this question, Baxter-Sagart’s system inherited Starostin’s hypothesis: these phenomena are attributed to the *-r coda in Old Chinese. Relating to the alternations of traditional “脂真”, “微文”, “歌元” rhyme groups, the Baxter-Sagart system argued that these phenomena are reconstructed as “*-Vr”, and the Old Chinese *-r coda evolved into zero coda or sonorant coda in Middle Chinese. This *-r coda hypothesis was supported by Hill (2014) and List (2016), but Wang (2019) argued that it has insufficient evidence in ancient Chinese documents.
　　Regarding these questions above, this paper aims to re-examine the rhyming principle based on Shi Jing in Anda Bamboo Slips. According to the materials, the *-r coda hypothesis does not receive positive support.

上古音; 白一平—沙加爾系統; 安大簡; 詩經; *-r 韻尾

Old Chinese phonology; the Baxter-Sagart system; Anda Bamboo Slips; Shi Jing; *-r coda