Abstract: A dynamic ECG system with tele-transmitting and receiving function by telephone is designed, which consists of the ECG recorder carried by patients, the ECG receiver used in hospital and the PC computer used to analyze ECG signals. The working principle of the designed system and the software design for the tele-receiving and analyzing of the ECG signals are introduced. This system has realized the tele-receiving and analyzing of ECG signal on the basis of conventional dynamic electrocardiogram.