Abstract: According to the development tendency of community medical monitoring system, a portable ECG monitor based on embedded system was introduced. The MSP430 was used as the core processor, collection of ECG signals was processed through the ECG circuit, wave form and relevant data were displayed on the LCD in real-time, and SD card was employed as the data storage device. All the data were transferred through the Zigbee wireless telecommunication device. The monitor takes full use of the advantages of the MSP430, which is low in power consumption and small in volume, has wide application in community ECG monitoring system, and provides an effective solution to community medical care and home monitoring.