《古文四聲韻》是一部廣徵博引的古文字典，由於此書多頭的來源，使其所徵引字形屢見異形的現象，本文試由「文字構形演變」的觀點予以探析。本文分析每個例字的構形演變，均蘊含了時間推移的概念，是以甲金文的標準形為依據基準，通過相互比較，才給予每個例字適當的定位。立基於此，本文將釐清《古文四聲韻》古文的構形現象，並經由此探索的橋樑，理解《古文四聲韻》某個古文字形為何會演變成某種構形。

Ancient Four Rhyme is a dictionary of ancient writings which contains extensive resources and references. Due to its multiple sources, it is often found that some Chinese characters indexed in the dictionary which should be the same word but are with various written forms. This article tries to analyze the phenomenon with a point of view of “the evolution of word-form construction.” The analysis of the evolution of representative Chinese written forms in the article includes the concept of the passage of time, using the standard form from inscriptions on bones or tortoise shells and bronze inscriptions as references to compare the words, and then assign the words with appropriate positions. Based on such idea, this article will clarify the word construction of ancient writings in Ancient Four Rhyme, and through the examination, we may be able to understand why a certain character would evolve to some other form in Ancient Four Rhyme.