MUSIC算法能有效地估计出独立信号源的DOA,并且在模型准确的前提下,对DOA的估计可以达到任意精度 但对相干信号源和相隔比较近的小信噪比信号源,MUSIC算法就不能估计出它们的DOA了。这里通过理论推导提出了一种改进MUSIC算法,计算机仿真的结果表明了该改进MUSIC算法既能够有效地估计出独立信号源的DOA,也能有效地估计出相关信号源和相隔比较近的小信噪比信号源的DOA,从而证明了这种改进MUSIC算法的合理性。-MUSIC algorithm can estimate the DOA independent sources, and in the model accurately the premise of the DOA estimates can reach arbitrary precision　But for coherent signal source and separated by a small signal to noise ratio of more recent origin, MUSIC algorithm is they can not estimate the DOA. Through theoretical analysis presented here, an improved MUSIC algorithm, computer simulation results show that the improved MUSIC algorithm not only can effectively estimate the DOA independent sources, but also can effectively estimate the associated source and spaced relatively close little faith noise ratio of the signal source DOA, thus proving the rationality of this improved MUSIC algorithm.