To implement intruder detection in fields, a Wireless sensor network-based system is developed. Motion sensors are placed at numerous locations around the farm. These sensors ceaselessly sense the movement and communicate to the organizer through Radio-frequency transceiver. The organizer on detection raises an alert and a call is made to the farm owner mobile through Global System for Mobile. Further, to differentiate between authorized and unauthorized entries Radio- frequency identification tags are used. WSN has been utilized in several applications such habitat monitoring, building monitoring. Wireless Sensor Networks accommodates detector nodes deployed in an exceedingly manner to gather data concerning surrounding atmosphere. Their distributed nature knowledge forwarding to the farmer. Intrusion Detection Systems will play a vital role in detective work and preventing security attacks. This paper presents current Intrusion Detection Systems using WSN technology.