The normal heartbeat is conducted from the atria to the ventricles through the normal conduction system, causing the ventricles to contract. There is usually only one conduction pathway from the atria to the ventricles, and a tissue structure called the atrioventricular node delays conduction from the atria to the ventricles so that the ventricles do not beat too fast. Patients with preexcitation syndrome are born with a pathway other than the normal conduction pathway, which we call the “additional bypass”. This means that when the patient conducts excitation from the atrium to the ventricle, he or she not only takes the normal pathway, but also takes an additional pathway. The additional pathway does not have an “atrioventricular node” that regulates conduction from the atria to the ventricles, so no matter how fast the atrial beat is, it can be conducted to the ventricles via the additional bypass, causing the ventricles to beat and contract very fast, which may put the patient at risk. Preexcitation syndrome combined with paroxysmal supraventricular tachycardia is characterized by a sudden onset and termination of the tachycardia, which we call “abrupt and abrupt tachycardia” and is the result of a sudden interruption of the cardiac excitation loop. This tachycardia is not usually characterized by a gradual increase or decrease in heart rate. Patients with preexcitation syndrome combined with paroxysmal supraventricular tachycardia can be triggered by many conditions, such as excitement and exertion. An interventional procedure called “radiofrequency ablation” can be used to treat this condition. It involves a small diameter cardiac catheter delivered through a vein or artery via vascular puncture to the heart. The “additional bypass” is located and ablated using radiofrequency current for the purpose of radical treatment. This test is less invasive and less risky, and is a well-established method for the radical treatment of preexcitation syndrome. It is important to note that not all preexcitation syndromes require treatment. In people who have never had a history of paroxysmal supraventricular tachycardia despite the presence of an “additional bypass”, the “additional bypass” may be a “bystander” and not “functional”. “function”, does not cause episodes of tachycardia, and therefore is meaningless, does not require treatment, is not life-threatening, and does not affect the patient’s physical health. However, for patients with pre-excitation syndrome who are engaged in dangerous occupations, although there are no tachycardia episodes, radiofrequency ablation therapy is also advocated for radical treatment. The main concern is the fear that the tachycardia may bring unexpected harm to the patient if it occurs when the patient is engaged in dangerous operations. In conclusion, after being diagnosed with preexcitation syndrome, do not have great concerns, not all preexcitation syndromes need to be treated, and “bystander” preexcitation syndromes do not need to be treated if they are not engaged in high-risk occupations. Only tachycardia combined with tachycardia requires treatment, which can be terminated by stimulation of the vagus nerve in acute attacks, or by intravenous drug infusion in the hospital if ineffective. For more frequent episodes of tachycardia, elective radiofrequency ablation is recommended for radical treatment.