Abstract: As to the wideband digital array radar (DAR)， the fluctuation of amplitude and phase in channel and the inconsistency among channels can be reduced by channel equalization， whereas the normal method is too sensitive to noise. Firstly， it puts forward an effective testing method for frequency response characteristics of wideband channel. Then the methods of choosing standard channel and feature-extracting of equalization filter are discussed. Then it brings forward an improved designing method for coefficients of equalization filter based on Fourier Transform. Finally an evaluating method for channel equalization effect in noise conditions is brought forwards. The effectiveness of above methods is validated through analyzing of equalization result.