针对证据合成过程中的冲突分配不合理、“一票否决”以及鲁棒性差等问题,提出焦元距离和焦元相似度的概念,并给出焦元距离矩阵和焦元相似度矩阵的定义.在此基础上,将证据合成分解为相关性证据合成与冲突性证据合成两个部分,建立一种基于焦元相似度的证据理论合成规则,并进行理论证明.对比实验表明,该规则可以合理地对冲突证据进行分配,有效避免“一票否决”现象,同时具有较好的鲁棒性. In view of the unreasonable conflict distribution, the “one-vote veto” and the poor robustness, the concept of focal distance and focal point similarity is proposed and the focal distance matrix and focal element similarity matrix On this basis, the evidence synthesis is decomposed into two parts: the synthesis of evidence synthesis and the synthesis of evidence of conflict, and a theory of synthesis of evidence theory based on the similarity of coke-yuan is established and theoretically proved.Comparison experiments show that Rules can reasonably allocate conflict evidence and effectively avoid the “one-vote veto” phenomenon with good robustness.