The transformation of basic probability assignment to probability is one of the main methods for combinational
evidence to decision-making assistant. However, the existing methods are lack of rational criterion, and can not get flexibility
and objectivity simultaneously. Therefore, a transformation is presented based on uncertainty degree weighting. The method
takes the process as a decision-making problem, chooses the Jousselme distance between the original BPA and the most
special BPA as the uncertainty measure. The most special BPA and transformation probability are got through united solving
method called “assumption-verification”. The experimental examples show that the proposed method is agreed with our
decision-making custom, and the transformation result is reasonable and effective.