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In flight test, the key flight test data contained in airborne ARINC429 data bus, it is very important part that acquiring ARINC429 data in flight test system. The previous technology of acquiring ARINC429 data , it consist of various components so that circuit volume , large power consumption and low reliability. In the background of new generation networking acquiring equipment, the new design way of DSP and FPGA put out, bus protocol Parsing by FPGA, data searching by DSP. This way makes good use of FPGA parallel computing and DSP neat features. Meanwhile, data sampling and delivering designed , and also applied in practical flight test engineering.