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when testing the digital closed-loop control aerospace servo system we use a measurement and control system based on 1553B bus control and A/D analog acquisition. When dynamic characteristics test is performed,the initiation delay between 1553B and A/D leads to inaccurate test results. In order to eliminate the influence of synchronization error on the dynamic characteristics of the servo system under the mixed control system, the reasons for the error of the starting point is analyzed,Combined with the characteristics of the digital closed-loop control servo system bus architecture,the measurement and control system introduced in this paper adopts the digital and analog acquisition zero synchronization technology based on PXI hardware platform.It overcomes the influence of synchronization error on the dynamic characteristics of the servo system under the mixed control system.It also improves the test accuracy.