The gas wave ejector is a new type of dynamic equipment that uses gas pressure waves to realize the pressure energy exchange process. Because of high efficiency, simple structure and low energy consumption, the gas wave ejector has broad application prospects in many production processes.According to the working principle of this equipment, the reversed compression waves formed at the medium pressure port could result in a large decrease of the equipment performance or even lead to the loss of function at high medium backpressure. Therefore, a workable feedback structure was proposed in this work to optimize the performance of the gas wave ejector by avoiding the formation of redundant compression waves under high medium backpressure conditions. The functional mechanism and performance of this structure were studied in detail by numerical simulation and experimental methods. By means of numerical simulation, the functional mechanism of the feedback structure to weaken the reversed compression waves through pre-compression was demonstrated. Meanwhile, the effective and evaluating criteria of this structure were proposed by the results of numerical simulation. To ensure the efficient operation of this structure, the minimum pressure in the flow channel of the stable-pressure region should be less than the medium port backpressure. And the efficiency improvement of this structure was positively correlated with the average pressure difference in the flow channel of stable-pressure region with or without feedback structure. By the experimental methods, the correctness of the numerical simulation was verified, and the actual application consequence of the feedback structure was obtained. By the application of this feedback structure, the maximum lifting capacity of equipment efficiency and ejection rate could reach about 6.93% and 5.43%, respectively. The investigation results demonstrated that the feedback structure was easy to implement and supplied a positive application effect under high medium backpressure conditions, which proved its promising application value.