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In WSNs, due to the restrict of sensor nodes, sybil attack is a harmful threat which is difficulty to be detected. After study of the sybil attack, a hierarchical grid-based scheme for sybil attack detection is proposed. According to the attribution of changing IDs of sybil nodes, the sybil attack is detected by determining preliminary location using hierarchical grid-based, furthermore, identities are certified using key encryption technology in grid. The simulation results show that sybil attack can be detected effectively by this scheme, storage, networks extention and conectivity are suit for WSNs.