弹性空间结构动力学建模的不确定性及分布参数等特点，使得空间结构的振动控制变得很复杂，这导致人们采取传感器和激励器同位置配置的直接反馈控制。针对弹性空间振动的特点，本文讨论了在具有已知概率分布的初始条件和二次型指标下最优直接反馈设计的必要条件，给出了计算机实现算法和设计实例。 Due to the uncertainty of dynamical modeling of elastic space structure and its distribution parameters, the vibration control of the space structure becomes very complicated, which leads to the direct feedback control of the same position of sensors and actuators. In view of the characteristics of elastic space vibration, this paper discusses the necessary conditions of the optimal direct feedback design under the initial conditions and the quadratic index with the known probability distribution, and gives the computer implementation algorithm and design examples.