The invention relates to the technical field of paper making, and discloses a method and system applied to paper tension adjustment. The method comprises the steps that a first hardness number of thesurface of a first paper roll sample is detected; and whether the first hardness number is within a hardness threshold scope or not is judged, if the first hardness number is not within the hardness threshold scope, an overpressure pressure value of a station corresponding to the first paper roll sample is adjusted, and the paper tension of a follow-up paper roll is adjusted. By means of the abovemanner, adjustment of the paper tension can be achieved.