  In this work the conducting properties of graphene lattice with a particular
concentration of defect (5\% and 10\%) has been studied. The real space block
recursion method introduced by Haydock et al. has been used in presence of the
random distribution of defects in graphene. This Green function based method is
found more powerful than the usual reciprocal based methods which need
artificial periodicity. Different resonant states appear because of the
presence of topological and local defects are studied within the framework of
Green function.
