To solve the protection problem of microgrid access to the traditional distribution network, a multi-agent scheme based current protection relaying for alternating microgrid is proposed. The proposed scheme not only achieves the better performance of the current differential protection, but also provides three-stage current protection in the power grid. Based on the power distribution system and current protection system structure, multi-agent structure for microgrid protection is studied and the flexible multi-agent based current protection relaying for alternating microgrid is elaborated. The demonstration shows that multi agent based current protection scheme can adapt to variety of alternating microgrid environment, which serves a better practicability.