A sensing system for sensing a position of a gear shaft , the gear shaft being provided, in its axial direction, with a plurality of groups of gear positions, the plurality of groups of gear positions including a plurality of neutral gear positions arranged along the axial direction of the gear shaft and a plurality of pairs of motion gear positions oppositely arranged at two sides of the neutral gear positions , one of the motion gear positions being a reverse gear position , while the remaining being forward gear positions (2031-2035), the sensing system comprising: a sensing magnet that is fixedly arranged on the gear shaft and moves with the gear shaft ; and a sensing unit arranged to be capable of sensing a magnetic field change when the sensing magnet moves, wherein when the gear shaft has a position change upon operation, the sensing unit senses the magnetic field change of the sensing magnet and generates a corresponding inductive electrical signal, the inductive electrical signal being compared against a pre-determined reference inductive electrical signal to indicate whether the gear shaft is at a forward gear position (2031-2035) or a reverse gear position , characterized in that the sensing magnet is axially partitioned into a first length region magnet and a second length region magnet ; a magnetic field direction of the first length region magnet at a side in contact with the gear shaft is a first polarity, while the magnetic field direction thereof at a side distant from the gear shaft is a second polarity; a magnetic field direction of the second length region magnet at a side in contact with the gear shaft is a second polarity, while the magnetic field direction thereof at a side distant from the gear shaft is a first polarity such that the magnetic field direction of the first length region magnet is opposite to the magnetic field direction of the second length region magnet. a sensing magnet that is fixedly arranged on the gear shaft and moves with the gear shaft ; and a sensing unit arranged to be capable of sensing a magnetic field change when the sensing magnet moves, wherein when the gear shaft has a position change upon operation, the sensing unit senses the magnetic field change of the sensing magnet and generates a corresponding inductive electrical signal, the inductive electrical signal being compared against a pre-determined reference inductive electrical signal to indicate whether the gear shaft is at a forward gear position (2031-2035) or a reverse gear position , characterized in that the sensing magnet is axially partitioned into a first length region magnet and a second length region magnet ; a magnetic field direction of the first length region magnet at a side in contact with the gear shaft is a first polarity, while the magnetic field direction thereof at a side distant from the gear shaft is a second polarity; a magnetic field direction of the second length region magnet at a side in contact with the gear shaft is a second polarity, while the magnetic field direction thereof at a side distant from the gear shaft is a first polarity such that the magnetic field direction of the first length region magnet is opposite to the magnetic field direction of the second length region magnet. <EOS>