The number of genetic tests for lung adenocarcinoma depends on the pathological stage of lung cancer and the need for treatment. Genetic testing is for effective treatment. Postoperative genetic testing is recommended for patients with lung adenocarcinoma stages I B to III, and the corresponding targeted drug treatment is matched according to the genetic test results. If there is no matching targeted drug, chemotherapy can be assisted. In order to understand the condition and treat the disease effectively, it is necessary to combine with other tests, such as CT, tumor markers and other related tests. For effective treatment, a 2nd genetic test is needed if necessary. Patients should cooperate with doctors for treatment, and do genetic test for lung adenocarcinoma also need to follow the physician’s instruction, and should follow the standardized treatment, and patients should not make treatment by themselves to avoid adverse consequences.