BEPCⅡ直线加速器微波系统要求的技术指标比旧系统有了大幅度的提高,为此老系统的许多部件需要重新研制和改造．本文首先介绍了关键部件的改造研制情况,它包括能量倍增器、加速管、大功率波导阀门、大功率干负载及其中功率和高功率波导衰减／移相器;其次简要介绍了微波系统高功率运行情况． BEPC Ⅱ linear accelerator microwave system requires technical indicators than the old system has been greatly improved, so many of the old system components need to re-develop and transform. This article first introduces the development of the key components of the reform, which includes the energy doubler, accelerator tube, high-power waveguide valve, high-power dry load and power and high power waveguide attenuation / phase shifter; followed by a brief introduction of the microwave system of high power Operating conditions.