A short PR interval is a short duration of the PR interval shown on the ECG, which may be normal or may be a condition such as preexcitation syndrome. Generally, short PR interval is often seen on the ECG, that is, between the beginning of the P wave and the QRS wave, and the normal value of the normal PR interval is 0.12~0.20s, between 120~200ms. If the PR interval is less than 0.12s, it is a short PR interval. Short PR interval may be normal, seen in children or adolescents, and some pregnant women. If there is no tachyarrhythmia, the patient can usually be reviewed regularly without treatment. Short PR intervals are also common in preexcitation syndrome, which is characterized by short PR intervals. If P is accompanied by recurrent episodes of tachyarrhythmia, such as supraventricular tachycardia and atrial fibrillation, it needs to be controlled with medications such as amiodarone, and treated with electrical cardioversion and radiofrequency ablation if necessary. If there is a short PR interval, it is recommended to follow medical advice for further investigation or treatment.