Small but significant anisotropic features with amplitudes of ∼0.1% have been reported in the arrival directions of galactic cosmic rays at TeV energies. In this presentation, we preform the modeling of the TeV cosmic-ray anisotropy outside the heliosphere using experimental data of the Tibet AS$\gamma$ experiment based on the idea of Liouville mapping. In the intensity-mapping process, we take into account for the first time the rigidity distribution of cosmic-ray particles observed by the experiment. We also improve the modeling of the cosmic-ray intensity distribution at the outer boundary outside the heliosphere to improve the reduced $\chi^2$ of the fitting. Small structures with angular scales of ∼10$^{\circ}$ are indicated in the intensity distribution at the outer boundary.