Normal electrocardiogram will be described from the heart rhythm, frequency and waveforms, etc. If normal, it will be written on the report form “sinus rhythm, generally normal electrocardiogram”. To really understand the waveforms and rhythms of the ECG, it is necessary to consolidate the basic knowledge system. In regular hospitals, after completing the routine multi-lead ECG, it will be interpreted by professional and experienced physicians, and basically, the ECG will be perfected before hospitalization or surgery, and a normal ECG will be reported as “Sinus Rhythm, generally normal ECG. Normal ECG is usually reported as “sinus rhythm, generally normal ECG”. Normal electrical conduction of the heart beat originates from the sinus node and passes through structures such as the right and left bundle branches of the atrioventricular node. Resistance, conduction speed, and passage time vary in each structure, typically in the P, QRS, T, and U bands, and abnormalities will be labeled as complete or incomplete conduction block, atrial flutter, and so on. It is recommended that in the absence of specialized knowledge, in order to read and understand the ECG, you can ask your doctor, and under the guidance of professional interpretation, you can carry out the corresponding observation or related treatment.