Mechanized pneumonitis is a chronic, dissipative inflammation due to incomplete absorption of fibrin in the alveoli and proliferation of large amounts of fibrous tissue, which results in the formation of mechanized pneumonitis. All patients develop the disease in their 50s and 60s, with no difference in gender. There was no correlation with smoking. Chest radiographs show bilateral diffuse alveolar shadows, with recurrent and wandering shadows being more common. High-resolution CT may show patchy, solid, hairy glass shadows in the lungs, mainly in the periphery of the lungs, especially in the lower fields of the lungs. Lung function may show restrictive ventilation dysfunction, and patients may have cough, fever, peripheral discomfort, fatigue, weight loss, dyspnea, etc. Bursting sounds may be heard on auscultation. Its treatment is currently mainly glucocorticoids, but also can be combined with cyclophosphamide, which has a rapid onset of action and can be effective. It can be applied intravenously and later orally.