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In order to improve the beamforming performance of broadband phased array systems, this article focuses on the delay compensation problem in broadband phased array systems. The frequency domain broadband array beamforming method is used to analyze the principle of using overlapping FFT for delay compensation in broadband phased array systems and the reasons for errors. Based on a 64 element broadband phased array system with a received signal bandwidth of 600MHz, the effects of overlapping FFT parameters such as subarray size, FFT points, overlap rate, bit width, and sampling rate on delay accuracy, signal fidelity, and beam performance were studied. The frequency domain broadband array beam synthesis technology was optimized while meeting the requirements of engineering applications. After research, it has been determined that the size of the sub array should not exceed 9 antenna elements, the number of FFT points should not be less than 512, the overlap rate should not be less than 1/16, and the bit width should not be less than 12 bits. This provides a basis and reference for the application of the overlap FFT method in practical engineering, and reduces the complexity of its engineering implementation.