The prevalence of arrhythmias in children is on the rise, and intracardiac electrophysiology and radiofrequency ablation is one of the more mature techniques for the treatment of arrhythmias. Transcatheter radiofrequency ablation for the treatment of tachyarrhythmias in children has achieved satisfactory results in cardiovascular medical practice, and the “Arrhythmia Clinic” currently performs hundreds of radiofrequency ablations each year with a success rate of 90%, as young as 1 year old. Cardiac arrhythmia refers to abnormal changes in the normal rhythm of the heart, faster than the normal heart rate (60-100 beats/min) is called tachyarrhythmia. Clinically, palpitations, panic, chest tightness, fatigue, dizziness and dizziness are the main manifestations. In severe cases, chest pain, dyspnea, cold and sweaty limbs, loss of consciousness, convulsions and other manifestations may occur. Five types of arrhythmias in babies should be alerted In recent years, clinical statistics show that the prevalence of arrhythmias in children is on the rise, and intracardiac electrophysiological examination and radiofrequency ablation is a more mature technology for the treatment of heart rate arrhythmias. Transcatheter radiofrequency ablation for the treatment of tachyarrhythmias in children has achieved satisfactory results in cardiovascular medical practice, and the “Arrhythmia Clinic” currently performs hundreds of radiofrequency ablations each year, with a success rate of 90%, as young as 1 year old. The procedure is usually completed in about 2-3 hours and the patient can be discharged in three to five days. The following conditions can be treated by radiofrequency ablation of cardiac catheter: 1. paroxysmal supraventricular tachycardia: sudden onset and stop of heart attack, each lasting from a few minutes to several hours, the diagnosis of tachycardia can be made clearly by electrocardiogram during the attack. Pre-excitation syndrome: Most of them can be clearly diagnosed by general electrocardiogram, but radiofrequency ablation should be performed if it is accompanied by recurrent episodes of tachycardia. 3.Atrial flutter and atrial tachycardia: Panic is the main manifestation, and some patients may have heart failure. Electrocardiogram at the time of attack can clarify the diagnosis. 4.Idiopathic ventricular tachycardia: without other organic heart disease, the panic is often accompanied by dizziness and sometimes syncope. 5. Premature ventricular contractions: Those with obvious symptoms, frequent premature ventricular contractions or poorly controlled by medication. The thickness of children’s heart, whether in the atria or ventricles, is much smaller than that of adults, plus the genital organs are not yet mature, and they are very sensitive to X-rays, which are easily damaged. This series of characteristics determines that patients who take RF ablation surgery for children must go to a regular pediatric specialty hospital.