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In the field of test and measurement, these have been a lot of Distributed Test System, and it is becoming more and more difficult to upgrade and maintain the supporting test applications. In this paper, one software incremental upgrading method for DTS supporting test applications is discussed. In this method, the publish/subscribe pushing mode based on NI middleware is used to achieve “one button” automatic upgrade, and the service middleware based on FTP is used to automatically download media files on the background. This method has technological advantages, less time for waiting the download, less manual operation link and high degree of automation. This method especially suits for the application scene of the test nodes with massive and personalized software deployment, and effectively reduces the difficulty of software upgrade and maintenance.