Dry weather will trigger the patient to have nasal congestion, because the patient is breathing air through the nasal cavity, if the humidity of the air is not enough, the patient’s nasal mucosa will be dry, and the secretion function of the nasal mucosa will be reduced, which will lead to the patient’s nose is particularly dry, and sometimes many crusts will be formed, blocking the path of the patient’s nasal ventilation, affecting ventilation. Therefore, patients must pay attention to moisturizing, put an air humidifier at home or workplace, mop the floor actively or spray physiological sea saline inside the nasal cavity, which is good for relieving nasal congestion caused by dry weather. Patients can also apply erythromycin ointment inside the nose, which can promote the recovery of the nasal mucosa secretion function.