Abstract: Cloud Services Delivery Networks(CSDN) build a layer distributed server network on top of Internet and provide users with cloud delivery services using the way to the nearest and on-demand. With no-liner and rapid growth of Internet traffic and three characteristics referring to the Internet traffic including a large scale video traffic, mobile traffic and interactive traffic presented by itself, in order to provide efficient and reliable cloud delivery services,CSDN faces many new challenges. hhis paper first described and analyzed the background and new challenges of CSDN, on the basis presented a classification model of the existing technologies from three dimensions infrastructure layer, platform layer and service layer et al. And then a comprehensive overview of the latest technologies of CSDN research was given,including networking inside CSDN nodes, server placement, content naming, content management, request parsing and system management. Finally, future research trend of CSDN was pointed out, that is the new technology issues what CSDN much-needed breakthrough, including cooperation, mobility management and interactive support al et.

Key words: Cloud service, Delivery networks, Cooperation, Mobility management, Interactive support