The purpose of this research is to investigate the current situation of national and international e-book ecosystem, reveal a conflict and suggest the improvement strategies regarding e-book lending service in public libraries. For this, an extensive research was conducted concerning overall e-book issues and reveled the criteria for each sectors. The relationship and different view between publishing and library sector were presented. Then, the five public library e-book lending principles, developed by foreign national or international library associations, were analyzed. The seven main principles were derived and mapped to the current practice of publishers. As a result, the possible countermeasures of the Korean public library were suggested, particularly in terms of the mission of public library, development a standardized lending model, and the revision of law.