Abstract: In order to evaluate the performance of multi-sensor in the process of information fusion,a distance is defined between Vague sets,and the distance between each object and positive,negative ideal objects are obtained based on the Topsis method.Next the comprehensive effectiveness evaluation index is introduced to evaluate the Performance of multi-sensor,and an effectiveness evaluation model of multi-sensor is constructed based on VagueTopsis method.Finally,simulation examples in the paper prove that the model is reasonable,effective feasible,and is of high resolution.