The '2021 academic annual meeting of the brachytherapy group of the radiotherapy and oncology credit association of the Chinese Medical Association', sponsored by the Chinese Medical Association and the radiotherapy and oncology branch of the Chinese Medical Association and undertaken by the Affiliated Hospital of Southwest Medical University, was held in Luzhou City, Sichuan Province from June 18 to 20, 2021. The theme of this conference is 'clinical application progress of brachytherapy'。