The selection of the source text holds immense significance in the translation process, serving as a reflection of the translator’s comprehension and stance towards the original work. Concerning the selection of source texts for English wardstranslations of Sanguo Yanyi, several characteristics emerge: first, uniformity among translators in their choice of source texts; second, confusion between the history of the Three Kingdoms and the fictional narrative; third, thorough investigation and profound research of early translators into their chosen source texts. Both internal and external factors influence the translators' selection of source texts. Internally, this encompasses the translators’ familiarity with the translated works and the translation mode. Externally, factors such as the popularity of editions during their era and the influence of publishers also play a significant role. Analyzing the translators’ selection of source texts illuminates the complex process of selecting source material when translating classical works. It also underscores the profound influence wielded by the source text in guiding the translation process.