根据三容水箱对象本身的特性，采用带遗忘因子的辅助变量最小二乘法对其CARIMA模型参数进行了辨识，并基于辨识所得到的参数模型，用广义预测控制方法对三容水箱的液位进行了控制。实验结果表明，采用此模型的广义预测控制算法有良好的控制效果。-According to the three characteristics of the object itself- tank, using an auxiliary variable with forgetting factor least squares model parameters were CARIMA its identification, and identification of the resulting model parameters based on generalized predictive control method for three- tank liquid level control. Experimental results show that this model is generalized predictive control algorithm has good control effect.