Abstract: Ambulatory electrocardiogram（ECG）, also called Holter or Holter examination, is a simple, efficient, accurate and safe noninvasive examination for the evaluation of abnormal ECG in patients with cardiovascular dissease. It is widely used in the evaluation of cardiac arrhythmiasof heart disease patients,occurrence of myocardial ischemia, drug efficacy, the state of implantable cardiac electrotherapy devices such as pacemakers, etc. At present, ambulatory ECG has been widely used in clinical medical institutions.It is necessary to standardize the training of this  technology. This paper refers to the relevant guidelines, consensus and expert suggestions, combined with the authors' experience, to write the standardized method of clinical operation of ambulatory ECG for clinical reference. 

Key words: electrocardiography, , ambulatory; , arrhythmias, myocardial ischemia, clinical operation, standardization