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Nondedicated distributed system is composed of many computers. Every computer has its owner user who has the highest priority using the computer. Special attention must be paid to the utilizing ratio of computer resource while computing tasks are allocated to distributed system. A relative queue model is constructed in this paper which is used to process data with synchronous relationship among them and perform data collection in multicomputer distributed system so we can calculate not only the resource utilizing ratio of individual computer but also the resource utilizing ratio of the whole system. Consequently, it can perform dynamic and real-time monitoring on distributed system resource utilizing ratio properly and conveniently. After implementing the model in a distributed system and comparing the implementation results with performance monitor in Window 2000, which is task manager, the results indicate that relative queue model proposed in this paper can real-timely and dynamically monitor multi-computer distributed system performance satisfactorily.