Left ventricular diastolic insufficiency is a manifestation of heart failure, which can be clinically categorized into four grades. Grade I criteria are that the patient is not limited in daily activities and has no obvious symptoms of heart failure. Grade Ⅰ: patients are not limited under the amount of daily activities, general activities without symptoms such as dyspnea and fatigue. Grade II: patients are limited under mild physical activity, no symptoms at rest, and no heart failure manifestations such as dyspnea under general activities. Grade III: The patient has obvious limitation in physical activity, and has heart failure manifestations at less than the general activity level. Grade IV: The patient has heart failure manifestations in a quiet state, and the symptoms worsen after activity. This classification is subjective, and the severity of the disease is usually assessed in conjunction with auxiliary tests. It is not recommended that patients evaluate their heart function on their own, and it is recommended that they evaluate their condition under the guidance of a physician and treat them appropriately.