对于参数不确定和外部扰动的空间飞行器姿态跟踪系统 ,本文提出了采用滑模控制的方法。利用误差四元数建立数学模型 ,选择了一类线性滑动流形 ,并且基于李雅普诺夫函数推导出滑模控制律。理论分析及仿真结果表明 ,本文所求控制律对空间飞行器跟踪系统具有全局稳定性和鲁棒性。 For spacecraft attitude tracking system with uncertain parameters and external disturbances, this paper presents a method using sliding mode control. A mathematical model of error quaternion was used to select a class of linear sliding manifolds, and the sliding mode control law was derived based on Lyapunov function. Theoretical analysis and simulation results show that the control law proposed in this paper has global stability and robustness to the spacecraft tracking system.