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The paper focusses on the security of large scale distributed wireless sensor network, we put forward a new key management protocol, which realized effective key management based on dynamic cluster and achieved secure cluster recycling. This protocol provides underpin for secure in-network data processing. According to the difficulty of factorization, the protocol can evict compromised nodes, confine the damage of compromised node to minimum and increase the survivability and scalability of network. Based on the energy sensitive protocol of cluster recycling, our protocol can balance the energy consumption of the whole network and prolong its life. At last, we provide the performance analysis and simulation results.