为保证COTS平台下的航空电子应用在航空电子全双工以太网(AFDX)上的时间确定性接入，设计了AFDX网络实时流量的中间件接入模型。通过基于中间层驱动过滤机制的协议转换，实现了双边网络的协议对接，并给出了帧顺序号(SN)的插入方法；通过对虚拟链路(VL)在时间上进行有效分配，避免了速率受限的数据流对物理链路的争用，在实现单条VL的BAG整形基础上提出了使实时流量抖动最小的VL复合时间调度算法。搭建典型实验环境对该模型进行仿真实验，结果表明，中间件模型能准确地实现数据帧TCP/IP协议与AFDX协议格式的相互转换，且该时间调度算法大大减小了VL复合所产生的抖动，保证了数据流传输的时间确定性。

To ensure the time determinability of avionics applications based on Commercialofftheshelf (COTS) platform when accessing into AFDX (Avionics Full Duplex switched ethernet) networkan AFDX realtime flow middleware was designed.Using protocol conversion function based on filtering mechanism of intermediate driverthe middleware achieved communications between networks running with different protocol.Core code of frame sequence number (SN) insertion was described.A time scheduling algorithm which has the minimum jitter aimed at VLMultiplexing was proposedby distributing the sendingtime of visual links(VL)it is able to avoid contention on a rate limited physical link.Finallyexperiments were made to test the performance of AFDX realtime flow middleware and the results showed that:the middleware model achieved the format mutual conversion between TCP/ IP protocol and AFDX protocoland the time scheduling algorithm can decrease jitter caused by VL multiplex apparentlywhich ensured the time determinability of AFDX communication.