[[abstract]]With the progress of information technology and massive use of Internet, the information organization pattern and search channel have been drastically changed. Since library generally plays an important role on information distribution, the librarians thereafter face various kinds of ethics issues. The librarian must bear the characteristics with thorough considerations and capability for making professional decisions in front of ethical issues. The main purpose of this research is to understand the professional ethics cognition of the academic librarians and decision of the academic library. This research is found mainly as follows： 1. When the librarians face the professional ethical dilemma, they make discuss with colleague frequently. But the final decision is generally proposed by the superior. 2. On the whole for academic librarian the basis of thinking for making policy of professional ethics is still according to the intension of ' The codes of ethics for librarians '. 3. Influence of the years of service influences on the professional ethics cognition of librarians and solution by librarians is significant. 4. There is difference slightly on cognition of professional ethics or solution by academic librarians that librarians practice in professional ethics course or not. 5. The difference in professional ethics cognition and decision between the librarians of national and private university is slightly. According to the analyses, propositions are presented as follows： 1. Popularize ' The codes of ethics for librarians '. 2. The lecture about ethics should be taken place regularly in school or library. The ability of librarians solve 'personnel issues ', ' copyright issues ', 'patron privacy issues 'also should be improved. 3. The teaching of Library Information Science should consider to include professional ethics courses. 4. To improve the sense of professional ethics on ' intellectual freedom ', ' equal ' and ' literacy ' . 5. The supervisors should promote the professional ethics and set the good examples. 6. To improve the practice about ethical decision-making model for librarian. 7. To revise ' The codes of ethics for librarians ' and the related law. 8. To research and make ' The code of professional ethics of academic librarian '.