Bipulmonary interstitial pneumonia is a type of pneumonia with damage to the interstitium, alveoli and capillaries within the lungs, also known as diffuse substantial lung disease, manifested by cough, hemoptysis, fatigue and weakness, wheezing and progressive dyspnea, which may progress to diffuse pulmonary fibrosis and cellular lung. 1. Types: Interstitial pneumonia can be divided into idiopathic and secondary according to the presence or absence of primary disease. The cause of idiopathic is usually unknown, while secondary can be caused by drugs, radiation, chemicals and so on. Idiopathic interstitial pneumonia can be divided into chronic fibrosis (e.g. idiopathic pulmonary fibrosis and idiopathic non-specific interstitial pneumonia), acute and subacute pulmonary fibrosis (e.g. acute interstitial pneumonia and cryptogenic mechanized pneumonia), as well as smoking-related interstitial pneumonia (e.g. respiratory bronchiolitis with interstitial pneumonia) and desquamative interstitial pneumonia. 2. Diagnosis: Positive clinical manifestations, CT, pulmonary function tests, bronchoscopy can confirm the diagnosis. 3. Treatment: The main purpose is to slow down the progression of the disease and improve the quality of life. Anti-fibrotic medication (e.g., pirfenidone) and symptomatic supportive therapy can be used to avoid irritating gases and second-hand smoke, quit smoking and avoid colds. It should be detected and treated early, and it is recommended to go to the respiratory department of regular hospitals in time when discomfort occurs.