Xuzhou Normal Univ, Dept Phys, Xuzhou 221009, Peoples R China
; Nanjing Normal Univ, Dept Phys, Nanjing 210024, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
We study an additional effect of energy loss of the projectile nucleons in unclear Drell-Yan process. With consideration of EMC effect and the energy loss effect,we predict the DY radio on the parton evolution model. An better prediction is given.