The advantage of physics and biology of heavy ions make them use in radiotherapy. However, the therapy tumor experience dose comes from X-rays and other radiation resources. How can the therapy planning of heavy ions be established by experience dose of X-ray and other radiation resources is a key problem. Dr. M. Scholz established local effect model (LEM) to resolve the problem. The LEM has been used in the therapy planning of heavy ions at GSI. In the paper, we use a new arithmetic which considers The advantage of physics and biology of heavy ions make them use in radiotherapy. However, the therapy tumor experience dose comes from X-rays and other radiation resources. How can the therapy planning of heavy ions be established by experience dose of X- ray and Dr. M. Scholz established local effect model (LEM) to resolve the problem. The LEM has been used in the therapy planning of heavy ions at GSI. In the paper, we use a new arithmetic which considered