Short PR is the expression of fluctuation on the electrocardiogram, in medicine PR interval is 0.13-0.2 milliseconds, when the electrocardiogram P-R interval appears to be less than 0.13 milliseconds, it is called short PR syndrome. In clinical medicine, there are generally two kinds of short PR: first, short PR is due to the patient’s psychological over-rapidity caused by the blood through the atria to the ventricle, the blood flow rate is accelerated, 0.13 milliseconds or less will complete the EKG PR wave, this belongs to the cardiac arrhythmia or cardiac rate irregularity caused by the patient needs to do a good job of heart rate control treatment; second, refers to the patient suffers from cardiac disease palpitations or tachypnoea that Secondly, it means that patients with heart disease have palpitation or tachycardia, which causes the heart rate to accelerate and is greater than the normal 120 beats/min. The faster the heart rate is, the shorter the PR wave is, which indicates that the short PR syndrome is more serious, therefore, patients should find out the cause of the heart disease in time to control it in a timely manner when the short PR syndrome occurs.