In general, bronchoalveolar lavage is relatively safe. It is generally necessary to improve the preoperative preparation, inform the patient and his family of the indications, contraindications and complications of bronchoalveolar lavage, and strive for the cooperation of the patient or his family, and some of the complications of bronchoalveolar lavage can be avoided. Common complications of bronchoalveolar cough include bronchospasm, bronchial hemorrhage, anesthesia drug allergy, fever, pneumothorax, and frequent coughing, etc. Most of them are transient complications, and the symptoms can be controlled and relieved.