The thesis describes the methods of prevention of noise in the exhaust nozzle of the aircraft, which is one of most interesting topic in aviation field. It is observed that noise arising from the exhaust jet can be reduced by using various techniques such as Chevron nozzles, modifying nozzle configuration and in case of turbofan engines by increasing bypass ratio. These methods are easy to implement and can significantly reduce the noise in exhaust nozzle of the aircraft engine.