An acute gas sensor is utilized to detect the presence of a combustible LPG leak in your car or in a service station, storage tank environment. This unit can be easily incorporated into an alarm unit, to sound an alarm or give a visible indication of the LPG assiduity. The sensor has excellent sensitivity Combined with a quick response time. The sensor can also sense isobutene, propane, LNG and cigarette smoke. If the LPG sensor senses any gas dropout from storage the output of this sensor goes down. This down signal is monitored by the microcontroller and it will identify the gas leakage. Now the The microcontroller is turned on LED and Buzzer. After few milliseconds delay. Gas leakage is a major problem with an industrial sector, residential premises etc. O-associated with the gas leakage is to Install a gas leakage detection kit at vulnerable places. The aim of this project is to present such a design that can automatically ascertain, alert and control leakage of gas. In this project, after the drop- off of gas is ascertained, the valve is automatically closed, thereby stopping the leakage. In particular, gas sensor has been used which has high sensible to gasses like propane and butane. Gas leakage system comprises of GSM module, which alerts the user by sending SMS.