In order to solve the problem of the protection mechanism SNCP (subnetwork connection protection) in power grid, this paper introduces a new technology, named ASON (Automatically Switched Optical Network) which is constructed by mesh network model, to improve the viability of the power grid. This new technology can realize the peer-to-peer business and adjust the routers dynamically. In this way, the intelligence level and resource utilization rate of the power grid network are increased. It also studies the break-before-create protocols, which keep generating the alternate routes to protect the power system and deal with multipoint failures. Commissioning results in Xianning Power Supply Company verify that the algorithm presented in this paper is effective to improve the safety level and the survivability level of the whole power system. This work is supported by National Natural Science Foundation of China (No. 50677047) and Natural Science Foundation of Hubei Province (No. 2015CFB563).