  This letter solves an open question of origami paper spring risen by Yoneda
et al.(Phys. Rev. E 2019). By using both dimensional analysis and data fitting,
a universal scaling law of a paper spring is formulated. The scaling law shows
that origami spring force obeys power square law of spring extension, however
strong nonlinear to the total twist angle. The study has also successfully
generalized the scaling law from the Poisson ratio 0.3 to an arbitrary
Poisson's ratio with the help of dimensional analysis.
