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As an important component of the electrical system on the rocket, the distributor plays an important role in the rocket flight test. The test of the distributor directly reflects the situation of the various functions, and the test method will affect the evaluation of the performance of the distributor. The testing system for distributor is designed which uses reinforced computer as hardware to develop platform. The testing system uses PXI data acquisition board to collect and control the conditioning signal, which test results and data is displayed on the monitor, to complete the functional test of the distributor. The prototype of the testing system is used to test the distribution device of an arrow, which is consistent with the design value. The testing system which has the advantages of small size and high reliability has greatly improved the previous test methods.