Wireless Sensor Network (WSN) has been emerging in the last decade as a powerful tool for connecting physical and digital world. WSN has been used in many application s such habitat monitoring, building monitoring, smart grid and pipeline monitoring. In addition, few researchers have been experimenting with WSN in many mission-critical applications such as military applications. In this paper, an innovative solution for intrusion detection system in sea is being presented. Intrusion detection on the sea is a critical surveillance problem for harbor protection, border security and the protection of commercial facilities, such as oil platforms and fisheries.