By developing the new services such as VoIP and Videoconference, using a mechanism is needed to support the quality of service of the application programs. Different models have been presented to guarantee the quality of service. Among these, the differentiated services can be mentioned which was presented by IETF. In the architecture of the differentiated services, no admission control mechanism is considered. To guarantee the quality of service, the differentiated services network should support the admission control mechanism. In order to have the best result of the admission control mechanism, the parameters of the network should be considered to decrease the rate of loss and delay as well as the increase of the network utilization. Therefore, due to the spontaneous evaluation of the efficiency of the different inputs and finding the best set of inputs which produce the best outputs, the Data Envelopment Analysis (DEA) is used. Data Envelopment Analysis is one of the scientific approaches which computes the efficiency using the strong mathematical basis. In this paper, first the parameter based admission control mechanism is added to the edge routers of the differentiated services network and implemented by NS-2 simulator. Then, the best set of inputs is using the DEA. Manuscript profile