There are different direct and indirect techniques existing to know the sound radiated from a machine or structure. Direct methods such as sound intensity method, sound pressure method and indirect methods or inverse methods such as Near-field Acoustic Holography (NAH) and beam forming are popular. NAH is one of the good inverse technique to predict the vibro-acoustic properties of a sound source at lower frequencies. As the NAH technique is an ill-posed inverse problem, regularization technique is used to overcome the problem. The purpose of the present investigation is to study the applicability of NAH method for source reconstruction at structural-acoustic coupled frequency. A box structure with one wall flexible is considered as a coupled system with an acoustic source inside the box. Sound pressure distribution on a flexible wall surface is reconstructed at uncoupled and coupled frequencies by using the NAH technique based on Equivalent Source Method (ESM). The effect of the Signal-to-Noise Ratio (SNR) on the reconstruction accuracy is also studied. The reconstructed results are good at the uncoupled frequency when compared to the coupled frequency. © 2016, German Acoustical Society (DEGA). All rights reserved.