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The structured model or distributed hash table (DHT) based peer-to-peer (P2P) networks are favoured in research but not in real applications. It's argued that the unstructured model is more suitable for the real world. This paper compares the advantages and disadvantages of the structured and the unstructured model, and proposed a clustered DHT (CDHT) communication scheme which addresses some of the fundamental problems of DHT by combining the structured model with the unstructured one. This combination leads to a new content location scheme which balances network traffic and improves the lookup efficiency for popular content. The experimental results show CDHT's superiority over DHT in handling dynamic network conditions and avoiding hot spots.