A aggregation method of incomplete weight information on criteria under conflict group is suggested. Firstly,
a minimum evidence distance calculation model among all evidence is proposed when the weight of criteria is taken as
evidence. Then the upper and lower weight values under the incomplete information are estimated based on the minimum
evidence distance. Furthermore, the weight factor of evidence aggregation is defined to solve the problem of conflict evidence
aggregation. The extension method on grey target decision is suggested, which estimates the possible target distribution range
of each alternative. Finally, the alternative evaluation on brown-field redevelopment is discussed.