Since 1993, many researches have been worked on the improvement of a patient monitoring system to make it more intelligent. In this paper, we tried to develop the patient monitoring system using fuzzy information. According to a trend from a client- server system to a web-based system, this fuzzy patient monitoring system was advanced by adding a web-based monitoring system which was offered with real-time per about 10 seconds. This system is operated in the Microsoft Internet Explorer 5.0 because of a FTP ActiveX control which transfers the updated-file of a patient monitoring information and alarms by pre-setting values on a server. This system offers not only real-time monitoring informations but also references of a patienf s ECG waveform and a past recorded data.