1.Imaging examination: Abnormal chest X-ray performance is often the first finding of lymph node nodulopathy, about 90% of patients show bilateral pulmonary hilar and mediastinal symmetric lymph node enlargement, which can be accompanied by reticular, nodular or patchy shadows in the lungs; 2.Hematology examination: routine blood test has no obvious changes, and there can be leukopenia, anemia, and increased blood sedimentation in the stage of activity progression. Some patients with calcium metabolism disorder cause high blood calcium, high urinary calcium, and even lead to kidney stones and renal dysfunction. Angiotensin-converting enzyme (ACE) for lung capillary endothelial cells and granulomatous tissue within the class of epithelial cells, alveolar macrophages produced, due to the serum ACE diagnosis of tuberculosis sensitivity of 57%, while the specificity is less than 90%, the diagnosis of tuberculosis is of limited value; 3, Tuberculin test: about 2/3 of the patients with tuberculosis, the skin test of 5 units of tuberculin did not respond or a Weak positive reaction. In China, since tuberculosis is a common disease, caution is needed when this result is used for the diagnosis of nodal disease, and the domestic literature reports that the positive rate of tuberculin test for nodal disease is 12% to 28%; 4. Nuclide scanning: 67Ga can be uptaken by activated macrophages and lymphocytes, and it often shows bilaterally enlarged hilar (in the shape of a λ-word) and mediastinal lymph nodes; 5. Histological examination: for enlarged hilar and mediastinal lymph nodes, the diagnosis can be obtained by transbronchoscopic lymph node needle aspiration biopsy, with an overall positive rate of about 60%. In recent years, with the application of EBUS-TBNA, the positive rate of lymph node aspiration has been significantly increased, and can reach 82%~92%.