Application of dimethyl fumarate to preparation of medicine for preventing and treating graft versus host diseases and graft versus leukemia

The invention relates to a purpose of dimethyl fumarate or a dimethyl fumarate-containing medicine composition to preparation of medicine. The medicine is used for preventing and treating acute graft versus host diseases after hemopoietic stem cell transplantation. Animal experiment study discovers that the dimethyl fumarate has the obvious effect of inhibiting the acute graft versus host diseases and can be used for preparing the medicine for preventing and treating graft versus host diseases and graft versus leukemia.