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In order to improve the convenience and accuracy of metal hardness testing, an on-line hardness testing system was designed and implemented, and the functions of information management and on-line monitoring were completed. The system is based on Django framework, using metal Barkhausen noise signal as detection data, realizing automatic and quantitative micromagnetic testing of mechanical properties by inquiring and calling the stored instrumental testing parameters and multiple mechanical properties quantitative prediction models from the database according to the actual testing materials and conditions. This system can receive and test the metal files uploaded by users online, and return the test results. At the same time, it also needs the information management system function of Barkhausen noise signal files. Users can download the signal files stored in the database at any time. Administrators can update and manage the existing database according to the newly measured data at any time. It facilitates the process of metal hardness testing.