In this paper,we analyze the representations for the Drazin inverses of anti triangular block matrices.Based on the matrix factorization,new representations for the Drazin inverses of anti triangular block matrices are given by using the properties of the Drazin inverses.%研究了反三角分块矩阵 Drazin 逆的表示，根据矩阵分解的思想，利用 Drazin 逆的有关性质，给出了反三角分块矩阵在一定条件下的 Drazin 逆新的表示。
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