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Denial-of-Service (DoS) attacks are recognized as a biggest threats due to the resources constrained property in wireless sensor networks(WSN). Especially, using some mobile nodes, we can attack the cluster heads in clustering network, this jamming can cause a serious damage in performance of WSNs. Because the cluster head collect and fuse the data from all nodes in cluster, and forward to the base station. It is hard to provide enough protection against this type of attack. We conducted a simulation to investigate the impat of the mobile jamming in cluster WSNs. The simulation results demonstrate that the mobile jamming we prosoed is more devastating than traditional jamming attacks.