The utility model discloses a guide post, the utility model discloses a guide post includes the column casing of hollow cylinder shape, is equipped with the post of living in the column casing, and the bottom of the post of living is provided with the piston, and piston and column casing sliding fit are provided with guide ring no. 1 on the piston, and the upper end of column casing is fixed withthe cover and establishes the uide bushing on the post of living, is provided with guide ring no. 2 on the inner wall of uide bushing. Compare in the clearance that traditional square guiding mechanism exists greatly and appear the problem of other card easily, the in -process that leads is being carried out to this guide post's structure, the phenomenon of other card can not appear, guarantees the stability and the reliability of direction.