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Double-channel monopulse tracking system is adopted in the ship-borne S-band tracking telemetry and command (TT&C) system. The tracking receiver need phase calibration to maintain consistency of the sun and difference channel to ensure the tracking performance. The traditional method is a way of town-tower phase calibration and offshore microwave self-checking, but it cannot meet the needs of increasing frequency points of the satellite,then a full-band calibration method is proposed. First elaborated the principle of two-channel monopulse system and the reason of phase calibration, and analyzed the composition of phase difference and near-field response effect on phase alignment. By analyzing the relation between phase difference and frequency variation under different physical length difference of sum and difference channel, the calculation method of fixed wave path difference of sum and difference channel is determined. Based on the analysis and calculation of the tower calibration phase data, the phase calculation formula of the whole working frequency band is obtained, and the correctness of the formula is verified. And concluded the seaborne calibration/correction method, which can effectively solve the problem of full-band phase calibration at sea in and improve the efficiency.