Optical Grid has been thought as a promising technology to support large-scale data-intensive distributed applications. For such a system with so many heterogeneous resources involved, faults seem to be inevitable. A fault in Optical Grid may lead to the failure of the application. Therefore, fault-tolerant policies are necessary to improve the performance of Optical Grid and satisfy the SLA requirements of the applications. In this paper, we propose several fault-tolerant policies for Optical Grid. The performances of different polices are compared by simulation.