Aiming at the multi-attribute group decision making method，which have the characters that the decision preference isconflicting and that the weight information is unknow, a decision-making method is proposed based on multi-object decision making. Firstly, The multi-objective decision model of decision scheme relative closeness and members of the decision-making preference conflict degree being choosing as the goals is proposed; Secondly, the attribute weights and decision makers weights are obtained by using the minimax method for solving the multi-objective decision model, and the optimal scheme is established; Finally, an illustrative example shows the effectiveness of the proposed approach.