The utility model relates to a self -imposed folding paper, include that having the first page or leaf piece and the second page or leaf piece of beam barrel and setting up the couple axle group in the beam barrel, the couple axle is organized and is included again, with first page or leaf piece relatively fixed's the first axle body, with second page or leaf piece relatively fixed's the second axle body, axially movable's the sliding shaft of setting between the first axle body and the second axle body, wherein, the relative sliding fit with the first axle body of sliding shaft, relative normal running fit with the second axle body still is equipped with the elastomer between sliding shaft and the first axle body. The utility model discloses do not need the fluting during installation, have self -imposed function in the angle that necessarily opens and shuts, above can stopping the optional position, can use the improvement result of use with buffering hinge collocation after the self -imposed angle when the in -service use.