Abstract: Sound field reproduction aims to create or reproduce a real spatial acoustic environment on the basis of retaining sound contents and sound field spatial characteristics. For a sound field reproduction listening system implemented in a real listening room, the acoustic transfer function of the loudspeaker array needs to be measured several times, which is cumbersome and time-consuming. In the case of low microphone sampling, an equivalent source interpolation method is proposed in this paper to realize the interpolation of the acoustic transfer function of the loudspeaker array in the whole target reproduction space. Compared with the traditional sound pressure matching method, the proposed method can effectively reduce the reproduction error and the measurement times of the acoustic transfer function of the loudspeaker array. As the influence of the reflections from walls in enclosures, the reproduction error increases under the reverberant condition, but it is still in the acceptance range.