  We consider the effects of Planck scale on four flavour neutrino mixings. The
gravational interaction at $M_{x}=M_{\rm planck}$, we find that for degenerate
neurino mass order, the Planck scale effects changes the mixing angle
$\theta'_{23}$, $\theta'_{12}$ values and $\theta'_{13}$, $\theta'_{14}$,
$\theta'_{34}$, $\theta'_{24}$ are unchanged above the GUT scale. In this
paper, we study neutrino mixing in four flavor above the GUT scale.
