Abstract:Scholars have made marvelous achievements in the research of S.202 Shanghan Lun, yet there are still some knotty problems to be solved. On the basis of previous research achievements, this paper attempts to interpret knotty char ̄ acters in S.202 Shanghan Lun with the knowledge of philology, based on the evolvement laws of Chinese characters and the variant characters in handed-down documents in order to uncover more truths about S.202 Shanghan Lun. The conclu ̄ sion offers a reference for further study on S.202 Shangh