中文摘要：

提出了改进的核密度模型，用唯象的方法找到了束缚核子内价夸克和海夸克的核效应的参数公式，其中利用了我们已经建立的核密度与原子核的平均结合能之间的联系．利用该模型所得到的束缚核子内部分子分布函数，对轻子与核的DIS（深度非弹性散射）过程的核效应给出了满意的解释，深化了对原子核内夸克分布受核效应影响的认识．

英文摘要：

In this paper, an improved nuclear density model is presented. The formulas of nuclear effect parameters R^A V（x, Q^2） and R^A S（x, Q^2） for the valence quark distribution and sea quark distribution in nucleus are derived, in which the connection between the nuclear density and the mean binding energy in nucleus is used. In terms of this model, the experimental data of the averaged nucleon structure function ratio of DIS process in loA are well explained.