Percutaneous septal chemical ablation therapy is a destructive treatment, which is to cauterize the suitable septal blood supply vessels (obstruction site) with anhydrous alcohol, resulting in interruption of myocardial blood supply to the septal obstruction, ischemic necrosis of the myocardium in the area, resulting in loss of myocardial contraction capacity in the area, and reduction or loss of myocardial contraction capacity in the outflow tract obstruction site when the left ventricle contracts as a whole. When the left ventricle contracts as a whole, the contractility of the myocardium at the site of outflow tract obstruction decreases or disappears, and the resistance to outflow decreases or disappears, resulting in a relative widening of the outflow tract and a reduction or disappearance of clinical symptoms. Since it is an injurious treatment and interventional therapy inevitably has certain risks in the treatment, plus the patient’s myocardium itself has problems, or cardiomyopathy has caused the patient’s complications, its interventional risk will also increase. Therefore chemical ablation is conditional, in addition to the previously described pressure step difference, the appropriate septal vessels, the clinical symptoms of the patient, the poor effect of the medication taken by the patient, the conditions of the operator’s hospital, the experience of all parties involved in the operator and the state in which the patient is. Therefore, interventional treatment is conditional, and a comprehensive analysis and evaluation is required to achieve safe and effective treatment.