在大规模并行处理系统中 ,采用共享存储和消息传递两种通信模型均存在各自的局限性 ,本文提出了一种新的改善共享存储系统性能的设计策略 :用户级共享存储协议 ,并在基于 X86处理器的分布式共享存储系统仿真器Sim DSM上对两个典型应用问题进行了测试 ,实验结果表明 ,它的性能比采用传统协议有显著提高 . In the large-scale parallel processing system, both the shared memory and the messaging model have their own limitations. This paper presents a new design strategy to improve the performance of the shared memory system: user-level shared storage protocol, Two typical application problems were tested on the Simulink X86 processor-based distributed shared memory system simulator. The experimental results show that the performance of the system is significantly improved over the traditional protocol.