This invention discloses one new motion sound generation method based on sound conversion, which comprises the following steps: training phase and emotion sound extraction for spectrum and basic property to establish middle sound and emotion sound map relationship on frequency spectrum and basic spectrum frequency; extracting mode parameters from middle sound and emotion sound by use of Gauss mixture mode and sort regress tree method to establish aim module parameters functions; generation phase to extract frequency spectrum and basic frequency property for conversion on basic frequency curvewith emotion property; finally integrating the converted frequency spectrum and basic frequency curve with relative emotion conversion sound.