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In order to resolve the vibration signal measurement and processing problem of the air heater in the rocket engine test, firstly, the measurement of the vibration acceleration signal was realized by using redundant configuration with two different accelerators. Secondly, the eliminating polynominal trend item and data smoothing pre-processing of the vibration acceleration signal was realized based on MATLAB programming method and then the final reasonable vibration acceleration signal was selected by analysis and comparing. At last, the vibration displacement signal was obtained by the quadratic integral analytic calculation in frequency domain. The test results verify the effectiveness and accurate of the measurement method and processing results and supply the credible, comprehensive and accurate vibration signal data for the analysis of the air heater.