The most common sites of lung cancer lymph node metastasis are hilar, mediastinal, and supraclavicular lymph nodes. Among mediastinal lymph nodes, subglottic lymph nodes are the most common. Lymph node metastasis is the most common spreading pathway of lung cancer. Lymph node metastasis of lung cancer goes from near to far, first to interlobular lymph nodes, then to hilar lymph nodes, into the thoracic cavity to sublongitudinal lymph nodes, to lymph nodes of various regions in the mediastinum, and finally to supraclavicular lymph nodes. Lymph node metastasis of lung cancer first invades lung segments or peribronchioles of lung lobes according to the drainage pathway, then reaches hilar and infraclavicular lymph nodes, and finally involves supraclavicular oblique muscle lymph nodes and cervical lymph nodes, and among these regions, hilar and infraclavicular lymph nodes in the mediastinum are relatively more frequent. Mediastinal and supraclavicular lymph nodes are usually on the same side of the primary lesion, or on the opposite side. There are also a few patients who do not have obvious metastasis of intraparenchymal and hilar lymph nodes, but have metastasis of mediastinal or distant lymph nodes, which is called jumping metastasis. If lung cancer is diagnosed, it is recommended to go to regular hospitals for specialized consultation, clear staging and standardized treatment.