指出了线性分配方法的决策结果可能产生逆序，然后提出排序向量和相对分配比 的 概念，以分析线性分配方法决策结果产生逆序的原因，并在此基础上构建顺序线性分配方法 ，最后通过算例验证顺序线性分配方法决策结果的保序性。

The problem that the liner allocation method can result in rank reversal is poin ted out. The concepts of sorting vectors and their relativity distribute ra tios are proposed to explain the causes of rank reversal. The improved liner al location method named sequence liner allocation method is analyzed to ensure ran k preservation. Finally the conclusion is validated with specific data.