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介绍改进后的北京正负电子对撞机束流位置测量系统的软硬件结构和系统的性能．改进后系统的位置测量重复性优于１０μｍ，测量一次闭轨的时间为１１ｓ，系统的动态范围大于８１ｄＢ，最小可测束流强度低于０．５ｍＡ，测量结果的可信度是通过自洽检测来保证的．
This paper introduces the hardware and software structure and system performance of the improved beam position measurement system of Beijing Electron Positron Collider. After the improvement, the repeatability of the system is better than 10μm, the time of measuring a closed orbit is 11s, the dynamic range of the system is greater than 81dB, the minimum measurable beam intensity is less than 0.5mA, the credibility of the measurement results is obtained through self-consistent Testing to ensure that.