The public library services are one of culture and education benefits administrations, which aim to fulfill the welfare states' obligations to basic living care of people. But in the age of multitude society, people's awareness of their interests is highly provoked; therefore, patron's interests conflict problems have become one of extreme dilemma to be overcome. Thanks to the above mentioned, from a Protective Regulation Theory perspective, this article seeks to rethink some non-interference in public library administration and patron rights protection issues with an Administrative Law Hermeneutics method. Finally, by close analysis of a real case, the article would like to propose a public library patron interests protection mechanism for librarians to deal with the related patron's interests conflict problems encountered.