基于快速以太局網中分布式并行服務器通信特點和對網絡協議棧的分析，設計并實現了一種分布式操作系統傳輸協議。該協議在維持通用編程接口的同時，精簡網絡協議棧底層的冗余操作，減少操作系統干預和協議自維護開銷。在8個節點的服務器系統上的測試結果表明，分布式操作系統傳輸協議獲得比用戶數據報協議更小的往返延遲和系統開銷，應用環境下有約20%的增益，能有力地支持系統擴展和大并發訪問服務。Aiming at the characteristics of the LAN of fast Ethernet and distributed parallel server system, a novel distributed operating system transport protocol (DOSTP) is proposed in this paper. The goal of this work is to study how to reduce the communication software overheads in the distributed parallel server system with off-shelf equipments, moreover to keep the common programming interfaces. Several measurements, such as decreasing redundant operations at underlying protocol stack, reducing OS interventions and the overheads of protocol self-maintenance, are used to improve the performance. Experiments have been done on the server of 8 PIII PC nodes and 100Mbps Ethernet with switches. Compared with UDP/IP, DOSTP decreases round-trip time of 20% for 64 bytes packets under the same application conditions.