Assume the quality characteristics of the products obey the Rayleigh distribution. Since there is a one-to-one relationship between the lifetime performance index and the conforming rate, we use the lifetime performance index as the quality parameter to design a repetitive group sampling (RGS) plan for Rayleigh products. The optimal plan parameters of the proposed plan are determined by satisfying the given producer's risk and consumer's risk at the same time by minimizing the average sample number and then tabulated for various combinations of acceptance quality levels. Then the comparison is made between the single plan and the RGS plan and the results indicate that the RGS plan is better than that one. At the end, an example is given to illustrate the proposed plan.