为充分利用ＮＳＲＬ的２００ＭｅＶ电子束流，作者为通向核物理实验厅的束流输运线进行了初步物理设计计算．结果表明，在尽可能利用已有磁铁、只增加一块新四极铁的条件下可以达到设计要求，使束流在靶位附近形成直径不大于７ｍｍ的圆柱形准平行束 To take full advantage of NSRL’s 200MeV electron beam current, the authors performed preliminary physical design calculations for the beam transport line to the Nuclear Physics Laboratory. The results show that the design requirements can be achieved by using existing magnets as much as possible and adding only one new quadrupole so that the beam will form a cylindrical quasi-parallel beam with a diameter of no more than 7mm near the target.