Dunhuang Manuscripts and Song Yuan Common word are important sources for the common words in the Great Chinese Character Dictionary. A comparison with the original source facsimiles reveals that a significant number of the vulgar character entries adopted by the Great Chinese Character Dictionary from these works are, in fact, spurious or erroneous characters that ought to be removed. Furthermore, issues exist regarding these common words, such as relatively arbitrary form standardization, inconsistent criteria for inclusion, and incomplete clarification of the relationships between characters. These problems require correction based on a comprehensive re-examination. Additionally, the citation examples for these common words are not exhaustive; they need further supplementation, with clear specification of the edition information for the sources cited.