1. Pay attention to and pay attention to your shortness of breath and cough and other uncomfortable feelings. 2, promptly go to the hospital, let the respiratory specialist understand your onset and related medical history in detail, and conduct physical examination and related blood tests, electrocardiogram and other tests to understand the relationship between lung disease and systemic diseases. 3, Chest X-ray: as a routine screening can detect most interstitial lung diseases, however, about 5% to 15% of patients with significant fibrosis will have normal chest X-ray performance. 4.High resolution CT of the chest (HRCT): HRCT can provide more accurate and detailed images than conventional chest radiographs, so the diagnosis has a higher sensitivity and accuracy. 5.Lung function test: Evaluate whether the ventilation and gas exchange function of the lungs are impaired? Exercise lung function can help to detect interstitial lung disease with early symptoms that are not obvious. 6.Arterial blood gas analysis: To detect how well the lungs exchange oxygen and carbon dioxide. Evaluate whether there is hypoxia and carbon dioxide retention in your blood? 7.Bronchoscopy: lesions in the lumen of the bronchial tubes can be observed. Also, transbronchial transmural lung biopsy (TBLB) or/and bronchoalveolar lavage (BAL) through bronchoscopy can help to make a diagnosis of certain interstitial lung diseases and to rule out other diseases that need to be differentiated such as tuberculosis, tumors, etc. The disadvantage is that the lung tissue obtained by bronchoscopy is small and often insufficient to make a definitive diagnosis. 8, Surgical lung biopsy: Taking a television-guided transthoracoscopic lung biopsy (VATS) or small open-heart lung biopsy (OLB) for pathological diagnosis is the most direct and reliable diagnostic method for patients with unclear diagnosis of lung lesions or patients with pulmonary fibrosis. It can determine the pathological type of interstitial lung disease and help in treatment selection and prognosis. However, this test is invasive and is not recommended for all patients.