针对航天测控FPGA异构平台中RapidIO多节点消息接收导致的资源线性增长及时序收敛难题，提出一种基于消息ID预处理与动态释放的固定通道复用机制。该设计构建“预处理 并行处理 资源释放”闭环架构，实现通道资源的自动回收与分时复用。实验表明，相较传统资源堆叠方案，本设计在支持海量节点接入时保持FPGA资源（LUT/BRAM）占用恒定，显著优化时序收敛性能并缩短编译周期。该方案已在国内多个航天综合化工程项目中得到应用验证。

Aiming at the problems of linear resource growth and difficult timing closure when an FPGA receives multi-node RapidIO messages on aerospace TT&C heterogeneous platforms, a fixed-channel multiplexing mechanism based on message ID preprocessing and dynamic release is proposed. The design establishes a closed-loop architecture of “preprocessing–parallel processing–resource release” to achieve time-division multiplexing of multi-node messages and automatic recycling of channel resources. Experimental results demonstrate that, compared with traditional resource stacking schemes, the proposed method maintains constant FPGA resource consumption (LUT/BRAM) while supporting massive node access. It significantly optimizes timing closure performance and reduces compilation cycles. The scheme has been validated through its application in multiple domestic aerospace integrated engineering projects.