Abstract: A method for quickly and precisely calibrating a medical imaging component after position change, comprising: placing a imaging component at a reference position, calibrating, precisely by a first measuring system, the reference position and obtaining a precise calibration value of the reference position; at the same time, performing, by a second measuring system, a second calibration for the reference position of the imaging component and obtaining a reference calibration value of the reference position; measuring, by the second measuring system, the current position of the imaging component and obtaining a reference calibration value of the current position; obtaining a precise calibration value of the current position via calculation based on the precise calibration value of the reference position, the reference calibration value of the reference position, and the reference calibration value of the current position.