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Great amount of transmission and calculation to form multiple-beam simultaneously caused by Wideband Digital Beam Forming Technology. And it requires extremely high-speed interface and computing resources. If the multi-channel broadband multi-beam forming performs centralizely weighting and summation operations, the FPGA resources are seriously insufficient. To solve this problem, the paper puts forward wideband digital beam forming technology based on interleaved transmission. It adopts the method of level by level decomposition for data synthesis processing. This paper describes in detail the high-speed data acquisition of broadband signals, and the efficient transmission of massive data, and the multi beam synthesis algorithm of large capacity data caused by broadband acquisition. Finally, 8 beams are formed by testing a 16 channel broadband input signal with an instantaneous bandwidth of 1 GHz, after data acquisition, transmission, data weighting and summation. The waveform formed by the test data is consistent with the expected radiation pattern. Experiments verified the correctness and effectiveness of the technology, and it has strong engineering application and promotion value.