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The group decision-making method based on linguistic judgement is studied in this paper. The method is based on the battlefield environment and characteristic, so it is close to battlefield condition and easy to show group advantage. In this method, firstly, individual linguistic judgment matrixs are integrated into a group linguistic judgment matrix with the linguistic weighted average operator, then the order is calculated by the linguistic average operator. A new method which is used for distributing the weight to individual decision and based on rough set clustering is proposed, when using the linguistic weighted average operator calculates the group linguistic judgment matrix.