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A DBF array can make full use of the spatial information obtained by the array antenna, and the super resolution and low sidelobe performance of the beam can be obtained by using the signal processing technique. It consists of antenna elements, RF down-converter, AD sampling, IF receiving system and PC controller. focusing on the specific scheme of digital beam forming for IF receiving system, a solution of amplitude and phase correction is proposed for each channel mismatch caused by multi channel reception and AD quantization consistency. In this paper, the key technologies during the development is analyzed. The experimental results show that the design of the DBF multi beam IF receiving system can effectively realize the correction of the channel mismatch, and realize the accurate beam forming function.