On the current research development of multiobjective decision making, a fuzzy inference based approach to aggregate the objectives is proposed. It based directly on the decision makers preferences and overcomes the limitation of traditional aggregation method that a certain function formulation must be specified. In fact, the fuzzy inference approach correspondes to a series of weighted arithmetic operator that the weights change continuously. And it can embody the preference structure that the ordinary aggregation method can not describes because its general approximate propert