There are different ways to allow the voters to express their preferences on a set of candidates. In the traditional voting systems, it isassumed that the votes of all voters have the same importance andthere is no preference between them. In this paper, a new approachis proposed to express the preference of voters on a set of candidates.In the proposed approach voters are classified into several categorieswith different importance levels in which the vote of a higher categorymay have a greater importance than that of the lower category. Thentwo models are introduced to measure the best preference scores of thetarget candidate from the virtual best candidate and the virtual worstcandidate point of view. After that, two obtained preference scores areaggregated together in order to obtain an overall ranking. Finally, twonumerical examples are provided for illustration the applications of theproposed approach.