The CREE Onrad is the perfect combination of the latest image-guided intensity-modulated radiation therapy system, accelerator and CT, which increases the flexibility of the irradiation angle and the flexibility of the CT imaging guide, while reducing the risk of collisions and operations. The accelerating tube is not only an image source of fan beam CT, but also a source of high-energy radiation. The zero error between the image coordinate system and the illumination coordinate system improves the image guidance accuracy. Multi task and integrated control system to achieve safe and efficient process radiotherapy.