CDN-P2P technology has recently become one of the hottest research fields. Recommending the valuable resources and improving accuracy of resource location and efficiency of content distribution for users, are CDN-P2P's challenges. This paper presents an overview of the field of CDN-P2P research in recent years from user requirements' perspective. It discusses user requirements and introduces ways of requirements acquirement. Based on CDN-P2P system over user requirements, this paper provides a comprehensive discussion on node characteristics and user similarity, relationships between nodes, nodes security and search mechanism. The difficult and hot issues about CDN-P2P system over user requirements are analyzed in depth. The future development trend and prospects for CDN-P2P system over user requirements are also discussed.