Chronic respiratory failure is a common multi-system disease in the elderly, which can be manifested as hypoxia and carbon dioxide retention, and is treated as follows: 1. oxygen deprivation is very serious and the patient can be given oxygen; 2. bronchodilators are used to release bronchospasm; 3. expectorant drugs are taken to promote sputum discharge to prevent carbon dioxide retention; 4. anti-infection treatment; 5. mechanical ventilation treatment, such as invasive ventilator or non-invasive ventilation treatment. Pay attention to the nutritional status of the elderly and multi-organ and multi-system diseases. Observe the elderly for hypoxia, blue lips, irritability, drowsiness, insomnia, etc. If there is, please go to the regular hospital for medical treatment.