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Dynamic characteristic is one of the important characteristics of aerospace electromagnetic relay, which needs to be tested and analyzed in the process of relay production and research. Under the existing conditions, the results measured by the dynamic characteristic testing system are saved in the form of text and image in the local machine, and researchers need to analyze the text file and image file by manual work. In order to solve the above problems, this paper designs a set of software for dynamic characteristic test system based on Windows Forms, which is divided into client software and server software. They realize the timeliness and reliability of text file and image file transmission based on Socket multithreading communication, breaking through the space limitation of researchers" local work. Drawing the waveform of text file based on double buffer technology strengthens the intuitive analysis of test results. Based on image call and local magnification technology, the effective processing and display of image are realized. The application results show that the designed system software runs stably, the analysis and display results are intuitive and accurate, and has high application value.