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To meliorate the operational rapidity and fault-tolerant ability of Backup Protection, this paper improves Rough Set Attribute Reduction methods and Decision Tree Classifier, converts protection problem into decision-making problem with uncertain and incomplete information. A new decision-making method of Intelligent Backup Protection of Regional Power Grids which makes use of protection information, circuit breaker information and direction information is proposed to cooperate with the existing main protection. The decision-making technique integrating both criterions derived from Rough Set and Decision Tree Classifier, improves the protection fault-tolerant ability and reliability. Simulation tests verify the effectiveness of the protection.