Theoretical and practical aspects of the feedback designed for decision support systems(DSS) are studied in this paper. Two kinds of feedback concepts, the decision state feedback and thedecision simulation feedback, are introduced, and their implementation schemes are proposed as well.In addition, the effects of the two kinds of feedback on the decision process are studied with care.Finally, two examples are analyzed, concluding that the feedback can well improve the performanceand the effectiveness of decision making. Theoretical and practical aspects of the feedback designed for decision support systems (DSS) are studied in this paper. Two kinds of feedback concepts, the decision state feedback and the decision simulation feedback, are introduced, and their implementation schemes are proposed as well. , the effects of the two kinds of feedback on the decision process are studied with care. Finally, two examples are analyzed, concluding that the feedback can well improve the performance and the effectiveness of decision making.