Interstitial lung lesions life expectancy can not be generalized, according to the lesions can be divided into idiopathic interstitial pneumonia, allergic pneumonia, eosinophilic pneumonia, etc., different types of lesions life expectancy is different. 1. Idiopathic interstitial pneumonia is also known as idiopathic pulmonary fibrosis. Clinical manifestations of chronic progressive dyspnea with dry cough, body fatigue, emaciation, most of them have a history of smoking; rational treatment is to improve the quality of survival of patients, the median survival period after diagnosis is 2 to 3 years. 2. Allergic pneumonitis, also known as exogenous allergic alveolitis, the main manifestations of fever and chills, generalized pain, cough and chest tightness, etc., from the allergens timely treatment can be a short-term recovery, recurrent episodes to form a chronic need for long-term treatment, the life expectancy and allergens have a close relationship. 3. Eosinophilic pneumonia is mostly seen in middle-aged women, the main manifestations are fever, sweating, cough, wheezing, weight loss and even respiratory distress, etc.; the treatment of glucocorticoid-based, mild condition 1 to 2 months to recover, the survival time of the sick and recurrent authors is usually lower than expected. It is recommended that patients should go to the respiratory department of regular hospitals for consultation and completion of relevant examinations if they feel unwell.