Abstract: Proposes a solution that can support quality of service guarantees on digital video broadcasting (DVB). The random early detection (RED) mechanism is a ready packet of scheduling and dropping algorithm on ATM. By referring to the RED mechanism and improving it according to the character of DVB, the method schedules the packets arriving in a gateway and allocates the buffer to meet the quality of service. Experiments show that the method has great effect on the average length and the average delay of queuing. The improved RED mechanism makes the DVB gateway to achieve higher transmission efficiency and ensures the quality of service guarantees.