The department was founded in 1983 initiated by Prof. Wang Jingbo、Xi Ning & Wu Dake with high reputations in China, which started to treat patients on May, 1987, with the guidance of Prof. He Yirong. With the help of famous oncologists Yu Zihao, Yin weibo & Xu guozheng from the Chinese Academy of Medical Sciences Cancer Institute & Hospital, the primary expert team led by Prof. Lang Jinyi has been composed with the mission of cancer diagnosis and treatnemt in 1990. In 2003, the Dept. was nominated as Class A key medical center of Sichuan Province, which is the only one in the field of tumor radiotherapy in Sichuan, up to now. In 2013, Prof. Lang served as the chairman of Chinese Society for Radiation Oncology（CSTRO）. In 2014, it was built as a national key clinical Department of Oncology.