Abstract: In this paper,according to the sound production model,the practical speech signal is an-alyzed by Linear Prediction technique,the glottal body velocity is exactly given by means of Inverse Filtering method;The glottal waveform is approached with vocal cord mass model,the feature parame-ter of vocal cord model is obtained,it is used to the analysis and diagnosis of hoarse speech.Experimental.results reveal that the analysis system has pragmatic value and provides a feasible method for stady of speech producing mechanism.