Preoperative care for congenital heart disease without cyanosis is differentiated according to the patient’s cardiac function, and those with poor cardiac function should have their activities restricted, and rounds should be strengthened. Complete various preoperative examinations. 1.Preoperative care for congenital heart disease without cyanosis. (1) Treat patients differently according to their cardiac function. Restrict their activities for those with poor cardiac function and strengthen rounds. (2) Complete various preoperative examinations. (3) Pay attention to the prevention and control of respiratory tract infection, (4) For patients with moderate pulmonary hypertension or above, administer oxygen three times a day for 30 minutes each time for one week before surgery. (5) For patients with severe pulmonary hypertension who are monitored by a floating catheter placed preoperatively, provide good care of the floating catheter. (6) In patients with poor cardiac function, pay attention to the infusion speed when infusing fluids. (2) Preoperative care for cyanotic congenital heart disease (1) Appropriately restrict the patient’s activities to prevent syncope or trauma. (2) Do a good job in explaining the work of the family and treat the child patiently to obtain cooperation. (3) Administer oxygen therapy as prescribed by the doctor, usually 3 times a day for 30 minutes a week before surgery. (4) Encourage the patient to drink more water because of the high blood pressure and low plasma content. (5) Patrol the patient more often to detect heart failure, hemoptysis, and hypoxic encephalopathy episodes in a timely manner, and report the condition to the physician for treatment if it occurs.