In new aircraft engine subject test, the engine inlet distortion performance test is important, its stability is related to the engine work reliable. Traditional way, multi-channel acquisition of cylinder inlet total pressure by the late data analysis to analyze the dynamic component of the extraction of total pressure, the way large delay and the extraction precision is low. So we design a dynamic component of inlet distortion real-time measurement extraction scheme, the sensor will the front cylinder inlet total pressure. The dynamic component of signal processing, high gain and filtering after the acquisition, and the total pressure signal in synchronization state, ensure data real-time correlation, in order to measure contrast, providing a new method for the amount of engine inlet distortion test. It has been verified by test and flight test, the dynamic pressure data acquisition precision as high as 0.3%, meet the requirement of flight test, and has been successfully applied in a machine of inlet distortion test.