Abstract: Theranostics in nuclear medicine is the combination of radionuclide imaging and internal radiotherapy, so as to realize the visualized diagnosis and precise treatment of diseases. At present, theranostics of nuclear medicine has played an important role in differentiated thyroid carcinoma, pheochromocytoma, bone metastases, neuroendocrine tumors and prostate cancer. China's medical radionuclides and radionuclide medicines are in short supply and heavily dependent on imports, so there is a "bottleneck" problem. It is necessary to strengthen the independent production, innovation and research of medical radionuclides and radiopharmaceutics of theranostics, so as to promote theranostics of nuclear medicine to better serve China's clinical practice.