There are two general causes of diaphragmatic hernia formation: traumatic diaphragmatic hernia and congenital diaphragmatic hernia, but their preoperative preparation is basically the same. 1. Maintain fluid stability. Correct dehydration, electrolyte disorders and acid-base balance imbalance. 2. Control infection. If there is upper respiratory tract infection or other inflammation, need to apply antibiotics in time to control the infection, such as taking amoxicillin, cefuroxime, etc., when the symptoms of infection are more serious, can be given intravenous azithromycin, ceftriaxone sodium and other antibiotic treatment. 3. Correct anemia or low protein. This kind of preoperative preparation is usually used for traumatic diaphragmatic hernia, traumatic diaphragmatic hernia will cause a large amount of blood loss, resulting in patients with anemia, hypoproteinemia, etc., can enter the blood products or albumin and other timely correction. 4. Reduce cardiopulmonary pressure and prevent postoperative abdominal distension. Gastric decompression tube can be placed before surgery to suction the stomach contents to reduce the pressure of diaphragmatic hernia on the heart and lungs, and at the same time can effectively prevent postoperative abdominal distension symptoms. 5. Maintain the airway and oxygenation. If the patient has obvious shortness of breath, dyspnea or cyanosis and other symptoms, it is necessary to timely administer oxygen, and clear the respiratory tract of foreign bodies to avoid respiratory tract blockage 6. Handle compound injury. This type of preoperative preparation is generally used for traumatic diaphragmatic hernia, which may be complicated by shock, and requires timely rehydration and blood transfusion to relieve the symptoms of shock. It is recommended that patients with traumatic diaphragmatic hernia go to the hospital for emergency surgery immediately to avoid delay; while patients with congenital diaphragmatic hernia can be treated with elective surgery if there are no obvious symptoms.