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Dynamic test is an important test for missile servo mechanism and reflects the performance status in essence. Aiming at the shortcomings of traditional electro-hydraulic servo mechanism dynamic test, such as large volume and long test time, a new dynamic test system for one missile servo mechanism was designed. By comparing and analyzing the existing test method for electro-hydraulic servo mechanism, namely sinusoidal correlation analysis method, spectrum analysis method, multi-harmonic phase signal test method and chirp signal test method, the chirp signal with good repeatability and sufficient coverage of the servo frequency band was selected as test excitation for one missile servo mechanism, which could significantly shorten test time, fully stimulate modal state, and complete dynamic performance test. The dynamic test system based on PCI bus and virtual instrument technology, was completed by using the IPC-610L computer and PCI-1706U multi-function data acquisition card, and the computer interface was designed by C# programming to realize data acquisition control, data process and data management functions.