In IEEE8023ah Protocols, the uplink bandwidth allocation algorithm is not clearly defined, which depends on the telecommunication device providers. Combined with the strong and multiples services requirements of smart distribution grid, the State Grid developed an OLT chip with QoS mechanism and responded EPON system. Compared with nowadays OLT chip in market, the highlight of our OLT chip is its multiple QoS mechanism. On the respect of dynamic bandwidth allocation, the priority allocate and bandwidth statistic multiplexing functions have been added..