This research report categorizes the radiation therapy by technology, products and applications. The technology market is divided into three types of radiation therapy, which are external beam radiation therapy, internal radiation therapy/brachytherapy and systemic radiation therapy. External radiotherapy's by-product is LINAC (linear accelerator); compact advanced radiotherapy systems is divided into CyberKnife, gamma knife and tomotherapy, and proton therapy system; and proton therapy system has two subsegments, which are cyclotrons and synchrotrons. Internal radiotherapy is divided into seeds applicators and electronic brachytherapy.