The purpose of this study is to find out the most successful way for the protection of medical information focusing on the electronic medical record(EMR). In this study, every aspect of the EMR is reviewed in terms of the hospital management. In particular, definitions, major functions, strengths and weaknesses of the EMR are considered. This study also examines the general development of the EMR as well as the current situation of applying the EMR. Important issues such as the protection of patient Medical information, informed consent, and the customer-oriented hospital information system are discussed and interpreted in light of the introduction of the EMR into the area of the hospital management. Finally, in this paper Protection of medical information by major Issues on Patient medical information.