Abstract: The common used near-field microphone array beamformers are usually optimized based on ideal sound field models, which are easily disturbed in practical applications. In this paper, the perturbation of the near-field microphone array is investigated using the room acoustic model. Three distribution models are discussed, including Gaussian model, uniform model with maximum limits and uniform model with mean limits. The comparion with the effect of different perturbation models is also made.. The results of simulations show that uniform model with mean limits has the best performance when it is used in the robust near-field beamformers. In addition, an inverse-filtering beamformer is introduced. It guarantees that each microphone has the same phase response at the focusing point by convolving the signal received by the microphone with the corresponding inverse filter. This beamformer can be applied to broadband signals in complex sound fields and has a shorter system delay than time reversal microphone array systems. Finally, a 32-units rectangular microphone array is used to compare the performance of the Delay-and-Sum beamformer, the robust focusing beamformer and the inverse-filtering beamformer. Simulations and experiments show that robust focusing beamformers have the best performance in the free sound field and sound fields with short reverberation time, and the performance of the other two is similar. The performance of the robust focusing beamformer deteriorates faster with the increase of the reverberation time