研究了数字状态反馈控制系统的有限字长（ＦｉｎｉｔｅＷｏｒｄＬｅｎｇｔｈ）结构的优化实现问题，主要考虑了系统的传递函数灵敏性测度．通过分析该测度一个上确界与实现所在坐标系的关系，得到了最小化该测度上确界的结构．仿真例子说明了优化的结果 This paper studies the optimization and implementation of FiniteWordLength structure of digital state feedback control system, mainly considering the transfer function sensitivity measure of the system. By analyzing the relationship between an upper bound and the coordinate system of the measure, the structure that minimizes the upper bound of the measure is obtained. The simulation example shows the result of the optimization