Abstract: As people get deeper and deeper into the scene audio research，the existing analytical methods can not satisfy the needs of people． The analysis method based on time-frequency domain characteristics can solve this problem well，by extracting the spectrogram of scene audio，the acoustic events included in the analysis signal can be fully retained，and it make the acoustic characteristics more intuitive． The spectrogram of scene audio contains rich texture information，by setting different length of the window，we can get the wide-band spectrogram and narrow-band spectrogram of the scene audio separately． The comparison experiment shows that the narrow-band spectrogram can better reflect the trend，continuity and distribution characteristics of the acoustic events in the analysis signal． It has better characterization than the wide-band spectrogram． Therefore，if the time-frequency domain characteristics analysis method is used for scene audio，it is best to use narrow-band spectrogram．

Key words: window function, narrow-band spectrogram, spectrogram, scene audio