Abstract: On the principle of“Multiehannal Signal Processing based on logicaveraging”described by Flowers et al in 1981,we have developed a newhardware and software system for real time recording of His-Purkinje activity on an every-beat basis.The methodology and concrete problemsof this new technique were discussed.There was a close correlation between spatial logic averaging methodand His bundle electrogram recorded by catheter electrode in 9experimental dogs before and after medication.It was proved that thenon-invasive every-beat recording of His-purkinje activity might be usedinstead of the invasive intracardiac electrode.We obtained 41 satisfactory real time beat-by-beat recordings ofHis-Purkinje potential from the body surface of 46 normal subjects andarrhythmic patients (multiple premature beats,atrial fibrillation andvarious A-V block patients),who accepted the spatial logic averagingexamination.The value of this new technique in clinical practice was demonstrated