Technological revolution that has conquered the world and the In the modern life, the internet network become important part in the life because it provides many effective services in many fields that leading the responsible Categories to interested in improve quality of services (QOS) for the network.There are increasing in using internet networks and many new modern services access in the life fields that leading to emergence of many problems and challenges in network. The delay is the most effected in the network because it caused reducing in QOS.The real time application is modern services such as voice and video which needing more time and effort to transfer data in the network because it have large data that making it to be the most effect applications by delay.A large number from network studding interested in create new technical to improve QOS in local area networks and wide area networks that using different technical methods. This study interested in showing the importance in using VLAN technology to improve QOS and it refers to its role in reducing the delay in the network.The structures of network when building it or improving it that is more important and sensitive thing that effected in ability it in providing the services in effective way. That referred to manage the networks and divided it into parts helping to transfer data in direct way to selected partition not all. Vlan technology mean divided the local area network in to many departments to give the security for each departments and acceleration of the arrival of the data, which sent to it. That in clearly referring to overcome the problem of delay when using VLAN technology and improve QOS for the networks.