Abstract: Acoustic vector sensor measures the pressure and particle velocity information of the same spatial point simultaneously,providing more information for array signal processing.The unitary MUSIC algorithm can reduce the computational complexity,improve the performance of bearing estimates. A unitary MUSIC algorithm is proposed for acoustic vector sensors array.A generalized transform matrix is constructed,and the observation data are incorporated with their conjugate,the covariance matrix can be decomposed in real-valued space.Finally simulation and lake trial shows that this algorithm has features of low computational complexity and suppresses background noise.