Most of security system uses light or micro switches, magnetic sensor to detect the signal. Here is a new type of security system that’s uses infrared rays to detect the signal. This signal is visible signals. Therefore once we install the circuit we need not requires any setting except to watch the power supply is ok.We have designed an electronic security system which can detect presence of people or obstacles. Whenever the infrared beam is broken or interrupted there will be an automatic alarm indicating that there is someone or something in the entrance. We aimed to design an electronic circuit using Infrared Ray. To build this circuit we used several components likes, Resistor, Comparator LM393N, Voltage Regulator (7805), Diode, Capacitor, Infrared Sensor ,Buzzer etc. Infrared sensor is the main part of this circuit. This security system based on infrared ray’s transmission and reception. This circuit is very interesting and can be used for various purpose.