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The structure of an researched engine in this paper is complex, and the test demands are diverse. To accurately obtain the performance parameters of the engine under various conditions and to monitor real-time health condition, it is necessary to develop a set of automatic test system to complete the tasks. Considering the test characteristics and test requirements of the engine, combined with the advantages and disadvantages of several kinds of typical existing test buses, an automatic test system of the engine based on VXI bus is present. The test system structure is designed and the resources configuration block diagram of the test system is given. To meet the requirements of the integrated layout of test, drive and load simulation, the typical circuit in the test adapter is given. To meet the demands of serial real-time instruction sending and real-time data saving, parsing, the effect of operation mode of the test software is studied. Further more, with the cooperation of the instruction threads and monitoring threads, multithread flow chart of the test software is given in this paper. Practical application shows that the reasonable structure of the test system is convenient in various situations. Without losing frames and making data error, the test software works effectively and real-time performance is good. The test requirements are met by the test system in the process of all kinds of engine test, and the test work can effectively be carried out.