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Distributed test system is widely used in industry, agriculture, military and medical fields. With the development of computer network technology and distributed processing technology, higher requirements have been put forward for the software development of distributed test system. It should not only satisfy the data transmission of many nodes, but also ensure the accuracy of data in the transmission process. In order to simplify the development of distributed test software, ensure the reliability of data transmission, and improve the reusability and efficiency of software development, based on NI Publish-Subscribe Protocol (NI PSP), a distributed test system software which can meet the requirements of large data transmission is designed by using shared network variable technology. Through the actual engineering verification, the software is simple to operate and stable in operation, which meets the design requirements.