In Internet Protocol Television IPTV systems, Quality of Service QoS is a critical factor for user satisfaction. In this paper, we first propose a queueing model for IPTV systems and discuss how to ensure the QoS of IPTV. We then use the model toyze the effects of IPTV traffic on other applications in home networks..Quality of Service QOS in Internet Protocol Television IPTV QOS management in IPTV are simplified compare to the QOS in the Internet. ISP is able to control the IPTV system as IPTV is a closed network. With the control of internet access links and due to that IPTV uses internet access, this would ensure the QOS of IPTV in an IPTV system..