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Considering the problem of lower applicability and objectivity of Quality assessment for weapon electronic systems,the paper proposed a new method of quality assessment based on TOPSIS and index weight improved by DSmT.Firstly, discrimination and importance degree of index are as the basic belief assignment from the subjective and objective point of view.Then the basic belief assignment was combined to get the optimal weight by using DSmT. Membership of TOPSIS is constructed based on the optimal weight.Finally,the new method was used to evaluate a induction setter.The results indicate that the method can get good efficiency on the system quality assessment and it is in line with the actual situation of equipment.The improved weight is more credible.The method has great value in engineering application.