Abstract: Based on the physical structure and the vibration characteristics of the unilateral vocal cords, this paper proposed a unilateral vocal cold vibration model. The far-field sound pressure distribution of the unilateral vocal cord vibration model was calculated on the usage of acoustic theory and Rayleigh Integral. The sound pressure distribution pattern was calculated by numerical simulation, which was compared with the sound pressure distribution of the normal vocal cold model in the radiated sound field. The results showed that the sound pressure ratio almost does not change with the change of the direction angle when the vocal cord gap width is identical in the audio frequency range. When the direction angle remains unchanged, the sound pressure ratio decreases linearly with the increase of pores.