Chronic obstructive pulmonary disease does not affect life expectancy under good control and can survive for a long time. If poorly controlled, recurrent exacerbations and progression of COPD lead to a progressively shorter survival time. If the disease progresses and pulmonary heart disease develops, patients may develop bilateral lower extremity edema, decreased activity tolerance, even telangiectatic breathing, and fluid accumulation in the chest and abdominal cavity, which can affect survival. In addition, patients with poorly controlled disease may also develop respiratory failure, which is the most important fatal factor of poorly controlled slow-onset lung, and can be corrected with non-invasive ventilators or even invasive ventilators in addition to medication. Therefore, slow-onset lung does not affect life expectancy. However, if poorly controlled and complications occur, the complications can shorten survival.