A simple and practical method for the calibration of digital array’s receiving channels is proposed.Theoretical analysis demonstrates that the LFM signal of zero intermediate frequency synchronization among the different receiving channels of an antenna depends on their phase and time calibration.The phase calibration of a wideband LFM signal in receiving channels can be converted into the calibration of a single frequency’s.The method of its amplitude calibration and the required measurment precision of the relative delays for receiving channels calibration are also derived.A wideband beamforming procedure is developed by using pulse compression based on channels calibration.The experimental results prove that the method is effective.