In this paper we present an improved nuclear density model. We have found the nuclear effect parameters’ formula RAV(x,Q2) and RAS(x,Q2) for the valence quark distribution and sea quark distribution in the nucleus, in which we have used the relation between the nuclear density and the mean binding energy in nucleus. By using the model, we can well explain the experimental data of the of Drell-Yan process in P-A.

Hong-Fei( ) 1;1) GAO Yong-Hua()HOU Zhao-Yu( ) 3,4 DONG Jian-Min( ) 1 DUAN Chun-Gui( ) 4 ZUO Wei( ) 1,5

In this paper we present an x rescaling paramenters' formula for partons in the extended x rescaling model,where we have established the connection between the rescaling parameter and the mean binding energy.Using x rescaling parameters obtained by the x rescaling parameters' formula,we calculate the average nucleon structure function ratio of DIS process in l-A(Al,Ca,Pb)collision to l-C collision respectively.The result is in good agreement with experimental data.

In this paper we present an improved double Q2 rescaling model.Based on this condition of the nuclear momentum conservation,we have found a Q2 rescaling parameters' formula of the model,where we have established the connection between the Q2 rescaling parameter ξi(i=v,s,g) and the mean binding energy in nucleus.By using this model,we coned explain the experimental data of the EMC effect in the whole x region,the nuclear Drell-Yan process and J/Ψ photoproduction process.

Using the empirical formula on F? (C)/F^1 (D) found by us and the analytical expression of the overall structure function of nucleon presented by CERN UA1 Collaboration, a simple calculating method on P+C -• 2jet+X process is presented. Our results will be checked by future experiments.