凉州瑞像因缘故事共有两个版本:《续高僧传》和唐天宝《凉州御山石佛瑞像因缘记》。后者在前者的基础上增加了“李师仁”这个角色,碑文刊布之后引发了学界的讨论。通过梳理可知,“李师仁”实际上是刘萨诃与凉州瑞像故事在中古时期河西民间传播过程中衍生出来的一个虚构的人物,其原型就是“离石人”稽胡刘萨诃:刘萨诃籍贯是离石,而中古时期“李师仁”和“离石人”读音相近或相同;其传记也具有共同性,在唐朝小说中留下了身影。“李师仁”的产生体现出历史撰写的层累特质,也展示了口头文学的特点。 There are two versions of Liangzhou Ruyi Cause Story: “Continuation of monks biography” and Tang Tianbao “Liangzhou Yuanshi Shifu Rui cause of mind.” The former adds the character “Li Shiren” on the basis of the former, and the discussion of the academic circle has been triggered after the publication of the inscription. By combing, we can see that “Li Shiren” is actually a fictional character derived from the story of Liu Sahe and Liang Zhou Rui in the midst of Hexi folk communication in the Middle Ages. Its prototype is “Lishi Man” Saha: Liu Sa is native to Lhasa, while in ancient times, “Li Shiren” and “Lishi Man” are similar or identical in pronunciation; their biographies also have common features, leaving a shadow in Tang novel. The production of “Li Shiren” reflects the layered nature of historical writing and also shows the characteristics of oral literature.