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The calibration accuracy and compensation effect of interstage installation error of inertial navigation system of multistage space equipment have direct influence on its navigation accuracy. In practical engineering application, the calibration of installation error is often a non-repetitive process, and there is a lack of testing means to quickly evaluate the accuracy of installation error. In order to improve the test coverage, an overall scheme of interstage dynamic alignment test is proposed in the system-level test phase, and a set of automatic equipment for detecting interstage installation error is designed. The test equipment is based on the control system of PXI bus as the core, and the turn table is configured to provide dynamic excitation. The upper computer test software based on LabVIEW development platform is equipped, and the test software uploaded to the product side is used to realize the test process. The application value of the test system is verified through the test. The further analysis of the test results reveals the problem of interstage communication deley of the inertial navigation system and improve the test method to provide the accuracy of installation error detection.