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In real-time monitoring of flight test, the high sampling data,such as flutter data, is generally analyzed and evaluated by means of time-history curve plotting, which must have the characteristic of real-time, high precision and enough length. In this paper, based on the detailed discussion, comparison and verification of NI PCI-6713 board in terms of the analog output, the curve plotting method of high sampling data based on NI-DAQ is researched and implemented, as a result, 16 channels high sampling data are plotted and printed on the client side. It shows that, the curves plotted by this method are accurate and reliable, meet the requirement in real-time monitoring.