The normal value of the QRS time limit on an ECG in a normal adult is usually between 0.06 and 0.12 seconds. The QRS in the ECG shows the potential changes during contraction of the right and left ventricles, and the normal adult QRS wave duration is between 0.06 and 0.12 seconds. Some diseases may cause abnormalities in the normal value of the ECG QRS wave, such as premature ventricular contractions, bundle branch block, right bundle branch block, left bundle branch block, left anterior branch, and left posterior branch, all of which can lead to the realization of incremental increases in this QRS. If the ECG QRS values are abnormal, it is recommended to consult a doctor to confirm the diagnosis and treatment. In addition, normal QRS values in children are different from those in adults and vary from person to person, and should always be determined under the supervision of a pediatrician.