  We outline an approach to calculate the transverse-momentum-dependent
distribution of linearly polarized gluons inside an unpolarized hadron on the
lattice with the help of large momentum effective theory. To achieve this
purpose, we propose calculating a Euclidean version of the degree of
polarization for a fast-moving hadron on the lattice, which is ultraviolet
finite, and no soft function subtraction is needed. It indicates a practical
way to explore the distribution of the linearly polarized gluons in a proton
and the linearly polarized gluon effects in hadron collisions on the lattice.
