漢語方言小稱詞長久以來已為學術界廣泛討論。然而，大部分研究的缺點在於語料與理論脫離、共時與歷時二分。有鑑於此，本研究以優選理論為架構，分析吳語鼻化小稱詞的歷時演變。首先，本文歸納吳語鼻化小稱詞的共時變異及歷時演變階段。隨後，本文利用「輸出－輸出對應」與「部分排序制約」來分析吳語鼻化小稱詞。研究結果顯示，小稱詞的各個階段決定於一組相同制約（MAX[nas], ANCHOR-SD(L), MAX-SD, IDENT-SD[nas], DEP-SD, *Vnas, *VoralN）的不同排序。再者，小稱詞演變過程中的過渡階段可以透過兩組「決定性的不排序」（IDENT-BD[nas]～DEP-BD, IDENT-BD[nas]～MAX[nas]）來呈現。另外，小稱鼻音尾[-n]或[-ŋ]的選取亦可藉由一組決定性的不排序（*dorsal～*coronal）來進行說明。總之，本文不僅解釋語言演變的動機及語言變化的選擇性，更建立語料與理論之間的聯結。

Fourth, the majority of extant historical accounts related to the militant
display of female private parts are to be found in unofficial historical
texts. This paper researches the writings of Qu Duizhi, Xu Yishi, Huang
Qiuyue, and Gao Boyu and so on. Based on the historical sources they
refer and topics to which they attend, I argue that the study of the history of popular psychology must pay adequate attention to unauthorized history and other informal writings. Because of these writers’ works, we no longer need to lament the inaccessibility of the “rare texts.”can also be coped with by a crucial nonranking (*dorsal～*coronal). Over-all, this study shows that OOC and POC function well not only to capture the motivations in diachronic change and the optionality in language varia-tion, but to bridge the gap between descriptive data and theoretical anal-yses.