Abstract: To solve the problems of dynamic vibration displacement and permanent displacement measurement at the launching nozzle during aerospace test, the data segmentation method of time domain integration was proposed by comparing traditional frequency domain quadratic integral, time domain quadratic integral, frequency domain-time domain hybrid integral and wang-zhou method. This method divides the data into three segments, and according to the vibration condition of each segment, the displacement curve was gained via time-domain integral. By comparing the two sets of processed data with the data extracted from standard displacement meter, it can be concluded that the maximum peak error of the curve is less than 20%, and the permanent displacement error is less than 8%. The experimental results indicate that the proposed method can better reflect the real vibration displacement tendency of the launching nozzle.