The purpose of genetic testing for lung cancer is mainly to detect the existence of gene mutation, if so, suitable targeted therapy drugs can be selected according to the actual situation to improve the effect of lung cancer treatment. Common lung cancer gene mutations include EGFR gene mutation, ALK rearrangement, ROS1 rearrangement and so on. According to different gene mutations, suitable drugs can be selected for treatment. Commonly used drugs for EGFR gene mutation include gefitinib, erlotinib, ectinib, etc.; commonly used drugs for ALK rearrangement include crizotinib, alectinib, ceritinib, etc.; commonly used drugs for ROS1 include crizotinib. Lung cancer gene mutation can be treated with targeted drugs, but also combined with radiotherapy and immunotherapy to improve the therapeutic effect.