Abstract: The indoor architecture and design of sports venues require careful consideration of both the acoustic environment and spatial aesthetics. Given that most venues have large volumes and unique shapes, they are prone to prolonged reverberation, leading to challenges like low speech intelligibility, echoes, and acoustic focusing. Consequently, specific architectural acoustic designs tailored to the venue's needs are essential. This paper outlines the architectural acoustic design process for an indoor gymnasium and swimming pool within a sports center. It begins by establishing a target range for the reverberation time, followed by utilizing sound-absorbing materials and strategic interior layout to reduce reverberation. The design's efficacy was affirmed through theoretical calculations and onsite measurements. Results indicate that the achieved acoustic environment fulfills the design objectives, adequately supporting the sports center's daily operational needs and serving as a valuable reference for future large-scale sports center projects.