Considering the influence of interference, the effectiveness evaluation indexes and corresponding quantization rules of warning radar are put forward. The weights of indexes are determined by AHP and entropy weight method. Considering the logical relationship among indexes, the aggregation method is improved, and index system is established to reflect the equipment efficiency more accurately. The algorithm of efficiency aggregation based on matrix operation is proposed, which contains the ability to deal with uncertain information, and the ability to aggregate the efficiency of indexes which restrict each other. The evaluation results are visualized by cloud model theory, and the concept of the attraction degree, and the principle of maximum attraction are put forward. The effectiveness of the warning radar under remote support jamming is analyzed, and good results are obtained. The feasibility of the improved method is proved. It provides decision basis for performance evaluation of single radar in jamming environment and performance ranking of multiple radars.