ＣＯＢＲＡＴＦ是一个采用多维两流体模型的反应堆热工水力分析程序。鉴于国内现有的ＣＯＢＲＡ版本多为ＣＯＢＲＡⅣ，本文以这两个版本之间的差异为线索，着重介绍了ＣＯＢＲＡＴＦ数学物理模型和数值方法上的特点。此外，本文还对ＣＯＢＲＡＴＦ的实际计算结果与标准实验的结果进行了分析比较。 COBRA-TF is a reactor thermal hydraulic analysis program using a multi-dimensional two-fluid model. In view of the fact that most COBRA versions in our country are COBRAⅣ, the paper takes the differences between these two versions as clues, and emphatically introduces the characteristics of COBRATF mathematical model and numerical method. In addition, the actual calculation results of COBRATF are also compared with the results of standard experiments.