Abstract: Real-time multimedia applications are getting more and more popular in the last several years with internet capability keeping improved, in order to guarantee the transmission quality of medium traffic, effective strategies for buffer management are applied in exchanging devices in flow medium network, such as switches and routers. Considering the characteristics of packet delay and loss sensitivity of medium data, this paper proposes a novel dynamic threshold algorithm at media traffic level for shared buffer packet switches, known as dual-dynamic threshold control based on E-model(EDTA). EDTA divides buffer management of switch into two parts: the global threshold strategy and the queue threshold strategy. The global threshold strategy controls the shared buffer by a whole threshold through judging different traffic scenarios to ensure good transmission performance in all situations. The queue threshold strategy decides and adjusts output queue threshold based on E-model traffic levels, which transforms several medium service quality effecting parameters into users’ psychological factors, thus guarantees the quality of flow medium data. Experimental results show that our proposed algorithm (EDTA) can improve the traffic performance for flow media more effectively, achieve better quality of network flow medium transmission, comparing with those algorithms using traditional control. And it is suitable to be used in any network condition and can improve the utilization of the network resources.