多媒体同步是多媒体展示必须解决的问题，而内同步又是同步技术的基础。本文基于联结的分布式网络环境及其QoS参数，利用限制性阻塞方案和阻塞性方案，提出了缓冲区Ｎ大小的分配策略，给出了其时态图、数学描述和推导，进而在理论上分析和说明了该分配策略的可靠性和正确性。

The problem of multimedia synchronization must be resolved on the multimedia presentation,and intra-media synchronization is its basis. In this paper, we propose an approach for allocating buffer N and give their time relationship figures, mathematics description and induction, with restricted blocking policy and blocking policy based on linked distributed networks and its QoS parameters. We analyze and demonstrate its reliability and correctness.