Chronic obstructive pulmonary ventilator with a few hours there is no uniform standard, need to be based on the specific conditions to decide, if the patient’s respiratory function can be improved can be withdrawn at any time, but if the continued failure to improve the words can be used all the time. If there is no respiratory function abnormality in patients with chronic obstructive pulmonary disease (no difficult to improve hypoxemia, hypercapnia, etc.), generally do not need to use a ventilator. However, if the patient has hypoxemia and hypercapnia that cannot be improved by medication and oxygen therapy, he/she needs to use the ventilator for adjuvant treatment. If the patient’s respiratory function can be improved, the ventilator can be withdrawn at any time, but if it cannot be improved, it can be used all the time. It is recommended that patients with chronic obstructive pulmonary disease go to the hospital, and under the guidance of the doctor to apply the ventilator and respiratory exercise.