本文研究带有空腔的锥形尖劈吸声器的吸声性能。文中给出了一种计算该吸声器的吸声系数的方法，并对吸声系数与频率的关系进行计算机仿真。仿真结果表明：带有空腔的尖劈吸声器相对普通尖劈吸声器，除保持高频段较好吸收性能外，在低频段吸声系数有显著提高；通过改变空腔结构可以改善吸声器的低频吸声性能。 In this paper, we study the sound absorption performance of tapered wedge sound absorber with cavity. A method to calculate the sound absorption coefficient of the sound absorber is given in this paper. The relationship between sound absorption coefficient and frequency is simulated by computer. The simulation results show that the sound absorption coefficient in the low frequency band is significantly improved except for the better absorbing performance in the high frequency range, compared with the conventional spike sound absorber. The sound absorption coefficient can be improved by changing the cavity structure Sonic low-frequency sound absorption performance.