Abstract: The paper introduces the algorithm of based on double-side of Optical Line Terminate and Optical Network Unit in Ethernet Passive Network,and presents a new frame framework of grant,every field of grant frame uniquely identifies one Optical Network Unit. we encapsulate all grants in a downstream frame, on the other hand, Optical Network Unit participates in the scheduling process too,which improves the bandwidth utilization of upstream and downstream. As can be seen from the simulation result,this algorithm has the good performance of delay.