  The neutrino mixing matrix is expanded in powers of a small parameter
$\lambda$ in tri-bimaximal mixing pattern. We also present some applications of
this parametrization, such as to the expression of the Jarlskog parameter $J$.
Comparing with other parametrizations (such as the parametrization in bimaximal
mixing pattern), this parametrization converges more quickly, but is of less
symmetry.
