Using the matrix of distribution law and based on some conclusions of row vector,a new method is provided to judge the independence of two-dimensional discrete random variable. Compared with some other methods,this method is an easy and practical tool for judging the independence of two-dimensional discrete random variables. And a lot of work can be saved in the process of judging the independence.%对两个离散型随机变量相互独立的问题,通过引入分布律矩阵的概念,借助矩阵理论中行向量的相关结论,提出一种新的判别独立的方法.与以往的方法相比,这种方法更为简单和实用,更重要的是具体操作过程中计算量大为减少.
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