The question of how long a person can live on an oxygen machine with loss of lung function cannot be generalized, but needs to be analyzed in light of the severity of the disease and the treatment. 1. If the condition is serious and not effectively treated, or if the patient has more underlying diseases and is not in good physical condition, and there may be other complications during the process of relying on the oxygen machine to maintain respiration, then the survival time cannot be projected and predicted. 2. If the respiratory function is gradually restored after receiving standardized treatment during the oxygen intake process, the life expectancy may not be affected. Loss of lung function by the oxygen machine can live for how long specific or in the doctor’s assessment of the patient’s condition to judge, this situation suggests that the patient first maintain a positive attitude, in the doctor’s help and active treatment.