Based on the characteristics of the vibration and noise order caused by the engine of the traditional internal combustion engine car, speed estimation using short-time Fourier transform (STFT), combined order tracking, order analysis of vibration signals of vehicle acceleration working conditions. Firstly, time-frequency analysis of transmission vibration signals in accelerated conditions using STFT. Secondly, the improved peak value method is used to extract the instantaneous frequency value corresponding to the feature order, and calculate the engine speed signal expression. Then, according to the engine speed signal expression, the vibration signal is re-sampled in the angular domain to perform angle analysis. Finally, the method of this paper is used to analyze the vibration signal of the gearbox acceleration process, and compared with the analysis results of the commercial software LMS.Test.lab, which proves that the method is feasible, and the vibration signal of the gearbox can be carried out without arranging the speed sensor. The order analysis provides a reference for the analysis of the vibration and noise order tracking test of the whole vehicle.