In recent years, the application of alpha particle-based nuclide targeted therapy in tumors has shown great potential. 225Ac is a nuclide that can be used for alpha radionuclide targeted therapy which has been studied at home and abroad. A number of preclinical and clinical trials have been carried out, and some achievements have been obtained. This article summarizes the current research status of several malignant tumors, and analyzes the challenges and progress faced by 225Ac in radionuclide targeted therapy.