The wireless detector network is wide employed in totally different areas of application like military applications etc. Wireless detector network is nothing however the cluster of detector nodes those area unit human action to every alternative mistreatment radio frequencies through the bottom station. Every detector node in network has the battery that is important and crucial to outline the lifetime of detector node. Due to distributed nature of these networks and their deployment in remote areas,these networks are vulnerable to numerous security threats that can adversely affect their proper functioning. This problem is more critical if the network is deployed for some mission-critical applications such as in a tactical battlefield. Random failure of nodes is also very likely in real-life deployment scenarios. Due to resource constraints in the sensornodes,traditional security mechanisms with large overhead of computation and communication are infeasible in WSNs. Security and energy efficient in sensor networks is,therefore,a particularly challenging tasks. This paper discusses the current state of the art in security mechanisms and energy saving techniques for WSNs. © 2016,International Journal of Pharmacy and Technology. All rights reserved.