In order to get a deeper research on the underwater acoustic transducer array and obtain the radiation impedance quickly and accurately, a measurement method based on near-field acoustic holography (NAH) for impedance characteristics of underwater acoustic planer array has been proposed. Using this method, the self-/inter-radiation impedance characteristics of the source plane can be obtained by the sound source surface information which has been reconstructed by NAH. For illustration, based on the NAH principle measurement model for planar array impedance characteristic, a five-element linear array and a nine-element planar array were used to numerically analyze this measurement method. And the pool test of the very low frequency transmitting transducer is carried out. Both of the numerical simulation results and the experiment results show that the NAH measurement method proposed by this paper has certain feasibility in measuring the impedance characteristics of the transducer.