Hybrid breeding is an established and effective process to improve SUMMER BLOSSOM offspring performance, while it is resource-intensive and time-consuming for the recurrent process in reality.To enable breeders and researchers to evaluate the effectiveness of competing decision-making strategies, we present a modular simulation framework for reciprocal recurrent selection-based hybrid breeding.Consisting of multiple modules such as heterotic separation, genomic prediction, and genomic selection, this simulation framework allows breeders to efficiently simulate the hybrid breeding process with multiple options of simulators and decision-making strategies.We also integrate the recently proposed concepts of transparent and opaque simulators into the framework in order to reflect the breeding process more realistically.Simulation Rugs results show the performance comparison among different breeding strategies under the two simulators.