With the functions of real-time recording and displaying parameters, multi-functional instrument is designed for monitoring the vital physiological signs of adult, pediatric and neonate patients. Mutiple vital signs are recorded in order to allow a comperhensive analysis of patient's condition. ECG, heart rate (HR), non-invasive blood pressure (NIBP), functional oxygen saturation (SpO2), respiration (RESP), body temperature (TEMP), as well as the optioned monitoring functions, such as end-tidal CO2 concentration (EtCO2), invasive blood pressure (IBP), cardiac output (C.O.), Cerebral State Index (CSI) are important mesuring indexs.