  We compute non-perturbatively the renormalisation constants of composite
operators on a $16^3 \times 32 $ lattice with lattice spacing $a$ = 0.093 fm
for the overlap fermion action by using the regularisation independent (RI)
scheme. The quenched gauge configurations are generated by tadpole improved
plaquette plus rectangle action. We test the perturbative continuum relation
$Z_A = Z_V$ and $ Z_S=Z_P$ and find that they agree well above $\mu$ = 1.6 GeV.
We also perform a Renormalisation Group analysis at the next-to-next-to-leading
order and convert the renormalisation constants to the $\bar{MS}$ scheme.
