This project is studying about rail welding, called Thermite welding .To build a railway route or fix a breakdown tracks cause high-speed running and cargo is too heavy. The railway have been welding can receive more mechanical impact strength better than before. It make a railway stronger and relevant to safety also can increase maximum speed of train and reduce maintenance costs because extend lifespan. Nowadays, rail welding technology has become particularly popular and more important because they are convenient and very safety