Abstract: Subspace-based algorithms for narrowband direction-of-arrival (DOA) estimation require detailed knowledge of the array response (the array manifold).Estimation accuracy and resolution ability can degrade significantly when the array response deviate from their nominal values.In this paper a.novel approach of array calibration method is presefited to alleviate this problem.It is different from other algorithms in that array manifold used in subspace-based methods is obtained through practical measurement instead of using ideal value.So it can calibrate errors of gain,phase,position,and other characteristics of the array sensors which are dependent of DOA.Spatial smoothing technique is employed at the same time to deal with the coherent sources case.Underwater experimental results show the efficiency of this method.