Taking "The Festschrift of Mu Dan" as the research object,errors among the historical facts in"The Festschrift of Mu Dan" has been analyzed and rectified from three aspects:Mu Dan's Family background,Mu Dan's reading and the narration about the December Ninth Movement.By extension,the errors among the detailed historical materials are not only a unique phenomenon in research on Mu Dan, but reflect to some extent the large number of universal problems in literature research that are ignored.At the same time,it provides an opportunity to discuss the identification of real literatur historical materials,the boundary of the validity of literature historical materials and the intervention of some subjective factors in the historical materials while analyzing the errors.