Complete right bundle branch block can occur in certain diseases and is also seen in normal individuals. Within the ventricle, the right bundle branch becomes impaired in the conduction of excitation, and complete right bundle branch block occurs when the duration of the QRS wave trains is ≥0.12 seconds. The main manifestations on electrocardiogram are QRS wave cluster, S wave and T wave changes. 1. In adults, the QRS wave cluster time is ≥0.12 seconds; the QRS wave in V1 or V2 leads is rSr type or M type. 2. Wide S-wave, widened and tangential S-wave in leads I, V5 and V6, with a time limit of ≥0.04 seconds 3. Mild ST-segment depression and T-wave inversion in leads V1 and V2; in leads I, V5 and V6, the direction of T-wave is opposite to the direction of terminal S, which is still upright. 4. Right bundle branch block can occur in rheumatic heart disease, congenital heart disease atrial septal defect, hypertension, coronary heart disease and pulmonary heart disease. In addition, right bundle branch block can also occur in normal people. Right bundle branch block can occur in a variety of diseases, in order to avoid delayed condition, delayed treatment, it is recommended that the patient consult a doctor in a timely manner, under the guidance of specialists to improve the detailed examination, to exclude related diseases, early detection and early treatment.