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BEPCⅡ直线加速器的重大改造旨在获得高流强、小发射度和小能散的正负电子束,以满足对撞机亮度提高两个两级的要求．这对直线加速器各系统和束流物理是一个挑战．文章介绍了直接决定束流性能的新电子源、新正电子源、新微波功率源、相位控制系统和束流测量系统等的改造情况;叙述了束流物理研究;介绍了束流调试进展情况和进一步改进计划．
A major modification of the BEPC II linear accelerator is to obtain positive and negative electron beams of high intensity, small emittance and small energy dispersions to meet the requirements of two-stage two-stage improvement of the collider’s brightness. This poses a challenge for each system of linear accelerators and beam physics. This paper introduces the reconstruction of new electron source, new positron source, new microwave power source, phase control system and beam measurement system, which directly determine the beam performance; describes the beam physics research; introduces the progress of beam current control and Further improve the plan.