Security is an important problem in wireless sensor networks. There are more attacks in WSN. Node replication attack is an important attack in wireless sensor networks which can be easily captured by adversaries. In this attack, the node will behave as an original node and collect all the information which is transferred in the network and passes to the attacker node. Some existing schemes are proposed for predicting the replica nodes. In existing method, the detection rate is less, communication cost is high. To increase the detection accuracy and to increase the communication cost, a History of Neighbor Node (HNN) method is proposed. The proposed HNN approach detects the replicated node locally and globally. The HNN method detection accuracy is high in any speed limit. Another approach also proposed for static mobile sensor networks, FEC approach, the replicated node is detected based upon the speed, direction and location. In random time the base station verifies the node with the observed speed and direction. The verification is conducted by the SPRT technique. The SPRT technique tests the node which should be rejected (clone node) or accepted (genuine node). Once the clone node is found quickly, then it is removed from the network. The proposed system has high detection accuracy and less communication cost and less energy efficiency when compared with the existing system.