  We study the spectral tilt of primordial perturbations in Horava-Lifshitz
cosmology. The uniform approximation, which is a generalization of the familiar
Wentzel-Kramers-Brillouin (WKB) method, is employed to compute the spectral
index both numerically and analytically in a closed form. We clarify how the
spectral index depends on the inflation model and parameters in the modified
dispersion relation.
