If osteosarcoma has metastasized to the lungs, chemotherapy, local treatment of lung metastases and surgery can be chosen to relieve and improve the disease under doctor’s advice. 1. Chemotherapy: Osteosarcoma is a kind of malignant bone tumor, which may metastasize to the lungs if the disease becomes malignant. It is recommended that patients choose chemotherapy to control the condition under the guidance of doctors, such as adriamycin, cisplatin, high-dose methotrexate, isocyclophosphamide and other drugs, which can relatively reduce the number and volume of lung metastases. 2. Local treatment of lung metastases: mainly including microwave ablation, radiofrequency ablation and stereotactic radiotherapy, etc. This treatment should be combined with systemic chemotherapy. 3. Surgical treatment: osteosarcoma is mainly treated by surgery, which requires radical resection of large pieces. Osteosarcoma lung metastases can be treated by surgery under doctor’s advice, such as osteosarcoma lung metastasis clearance surgery, stripping surgery, etc., and the best treatment plan should be chosen according to the patient’s own situation. It is recommended that patients follow the doctor’s instructions and take medication on time during the treatment process, which can help the recovery of the disease.