It's the technological era now; and it's the timing for the traditional paper medical record to be changed into electronic version in Taiwan. Electronic medical record (EMR) has eliminated many paper medical record's drawbacks; such as occupying too much room, taking time to deliver around, hard to preserve for a long time, and hard to share by different professionals at the same time. EMR also offers opportunity for health care providers to improve their operation and elevate health service quality. Although EMR sounds so perfect, there are still many problems need to be solved, e.g. arbitrary re-writing, possible invading by hackers, and how to protect patient privacy. This article discusses how to apply EMR to protect patient privacy. For implementing EMR, many regulations have already enacted to protect patient from possible invasion. However, regulations cannot provide guidelines to health care providers of how to apply EMR. Hence, a genuine example of implementing EMR is needed. In this article, examples from Chung Shan Medical University Hospital demonstrate how to control and monitor an EMR system to protect patient privacy.