First, the time of postural drainage is usually before the patient eats, and it is best to choose to do it in the morning and evening, because doing postural drainage after meals may increase the chances of vomiting in patients; second, before doing postural drainage, you must communicate with the patient in advance to prepare the patient psychologically, and at the same time encourage the patient to cough appropriately during the drainage, and you need to encourage the patient more; Third, the patient should not be too rigid when doing postural drainage, but should be able to accept it lightly and promote sputum excretion; fourth, when doing postural drainage, you should always pay attention to the patient’s condition, such as whether there is hemoptysis, cyanosis, sweating or dizziness, fatigue, if the above situation occurs, you need to immediately stop doing the operation of postural drainage to avoid the danger of the patient. Postural drainage will be done about 3-4 times a day, and each time should not be too long, almost 15-30 minutes.