Abstract: To improve the efficiency and the topology mismatch problem of P2P overlay network, a new strategy of topology construction, POCLS, was bring forward. Nodes in POCLS were organized as autonomous domains based on their physical location. Then the nodes in a domain were formed in different semantic clustering according to their resource shared. The P2P overlay network of POCLS was supervised by domain and clustering simultaneously. Simulation results show that the query delay and traffic redundant was effective reduced in POCLS, at same time the query success rate was ensured.