Targeted therapy is effective in treating cancer, and the drug should be applied under the guidance of a doctor. One of the main treatment methods after cancer diagnosis is targeted therapy. Targeted therapy is cancer therapy at the cellular and molecular level, and the main mechanism is to target the cancer-causing sites that have been clearly identified. This therapy has the advantages of precision, low side effects and good efficacy. Clinically, it can be used for postoperative adjuvant therapy, advanced stage patients with no chance of surgery and recurrence patients. Commonly used drugs such as gefitinib and ectinib targeting growth factor receptors; sorafenib targeting vascular endothelial growth factor. Most of these drugs require genetic testing before use to determine whether there is an indication. Targeted therapy can often be combined with radiotherapy, chemotherapy and other therapies. Drugs should be used under the supervision of a doctor.