Lung cancer is the leading cause of cancer-related death worldwide, molecular target therapy has become a hot research direction of non-small cell lung cancer (NSCLC) treatment. RET fusion gene with an identifiable clinical pathological features, is present in some subsets of lung cancer, and its treatment is effective by RET inhibitor, suggesting that RET fusion gene may be a new target for individualized treatment to the subgroup of NSCLC. This article reviews the structural characteristics of RET fusion gene and expression model in clinical samples, and treatment of NSCLC.