The process of "digitization of microfilm" for Ming and Qing dynasty archives is essentially a re-copying process of traditional precious historical paper archives. During this process, it is inevitable to correct and remedy quality issues stemming from technological and historical limitations in order that the digitally converted electronic files could align closely with the content of the original microfilm archives. By clarifying and summarizing the quality dilemmas encountered and the corresponding management strategies during the second heterogeneous conversion, we can not only ensure that the content of historical paper archives is authentically and comprehensively preserved, but also facilitate the efficient and effective transformation of archival information across different storage media, thereby promoting the multi-media protection and utilization of traditional precious paper archives.