Abstract: Based on the privacy management theory， this study adopts the in-depth interview method to reveal individuals’ management practices regarding the privacy boundaries of digital reading traces from three progressive levels， namely privacy boundary recognition， privacy boundary coordination， and privacy boundary balance. It promotes an understanding of the dynamic relationship between individual reading behaviors and social reading interactions in the digital reading era. The study finds that privacy boundary recognition is mainly identified according to three types: users’ privacy sensitivity， the affordance of platform technologies， and the social publicity of reading. Privacy boundary coordination is negotiated through the degree of relationship， the attributes of traces， and the principle of reciprocity. On this basis， the study reflects on the hidden concerns caused by the out-of-control coordination of digital reading traces privacy boundaries and proposes optimized paths such as the privacy boundary management mechanism under the refined segmentation of social relationships， the deidentification-based classification and dilution mechanism for digital reading traces， and the multi-level negotiation mechanism for the visibility degree of digital reading traces.

Key words: font-size:medium, background-color:#525659, ">Digital reading traces , Visibility , Privacy boundaries , Self-management