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An instrumentation ship of spacecraft is an offshore platform with ship-borne TT C system. Its role is to marine measurement and control mission. When the instrumentation ship is built or overhauled, the ship-borne TT C system shall be calibrated. The tower phase calibration for ship-borne TT C system at anchor is essential. This study will help to improve the understanding of the calibration process of tower phase calibration under mooring conditions and improve the calibration accuracy of ship-borne TT C system. Based on the differential mode tracking principle and phase calibrating principle of dual-channel monopulse radar, the relationship between phase calibration error and ship movement was analysed and simulated under the condition of far field. According to the simulation conclusion, some proposals about phase calibration of ship-borne TT C system at anchor are offered in this paper.