While a hybrid car at idle charging, due to the high power of the engine and low background noise, the perceived half order “dada” sound inside the car often causes user complaints. In order to accurately analysis the noise frequency and the order information that causes the response frequency, it is necessary to develop a new analysis method to describe its characteristics and evaluation criteria. This article focuses on the “dada” sound inside the car of hybrid vehicle under high power charging conditions. Based on the Double-FT order frequency analysis method, this method obtains time-frequency characteristics by performing short-time Fourier transform on the source signal, transposing it, and then performing Fourier transform again to obtain the contribution energy of each order at different response frequencies, thereby achieving order contribution analysis of the source signal. This analysis method was used to establish an objective evaluation method for sound quality with order characteristics, and to objectively evaluate sound with different performance of order sound quality under different power. There is a good correlation with subjective evaluation, indicating the feasibility and effectiveness of this processing method. This provides a new processing and evaluation method for the analysis and evaluation of sound quality with order characteristics in the idle of hybrid vehicles.