Abstract: A positioning system and a positioning method are provided. The method includes: receiving, via a movable base station (MBS) disposed on a vehicle, radio data at a first time point; performing RTK calculation according to the radio data to obtain a rover position of a second time point; obtaining an attitude angle variation of a rover between the first time point and the second time point; calculating an MBS position of the second time point according to the rover position of the second time point and the attitude angle variation; positioning the vehicle of the second time point according to the MBS position and the rover position of the second time point; and calculating a carrier phase difference between the MBS and the rover at the second time point to update the radio data at the second time point.