Abstract: We analyzed the defects of the existing way to determine the weight of evidence,and gave a new modified method based on the present method.It calculated the evidence primary weight via similarity between evidence and ave-rage evidence.When the weight value is less than the threshold value,the evidence is removed from evidence group,and the weight of remaining evidence is calculated.By K iterations,until all the evidence weight is higher than the threshold value,arithmetic average value of K evidence weights is calculated.Finally,D-S combination rules is used to combine the weighted average evidence.An example indicates that the new method can give the more reasonable combination results compared with D-S combination rule and other modified methods.

Key words: Conflict evidence,Average evidence,Evidence weight,Combination rules