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Kademlia is a famous routing algorithm based on DHT in P2P network research. To conquer the shortages of Kademlia in searching efficiency and the strategy of cache, an improved Kademlia routing algorithm is proposed which can accelerate the hotspots inquiry speed in P2P network and is implemented by using fast table look-up and weights setting method. This technique avoids inefficient inquiry under the high refreshing frequency in cache and congregates hotspot resources for high query hit rate. Simulation tests show that the improved algorithm has lower average route step and inquiry time delay than the original one.