Abstract: In traditional airborne data recording software testing process, many problems occurred when testing the software storage output interface because of the repeated download process or too many code instrumentation, such as low efficiency and low credibility. In order to improve the efficiency and credibility of the test, a storage data output mechanism based on virtual device is proposed. By replacing the real physical storage devices, the virtual device transmits the data written to the storage originally to the test monitoring terminal in the testing environment. Finally, the feasibility of the method is verified by building a virtual prototyping environment based on virtual instrument.