The starter is divided into DC starter, gasoline starter, compressed air starter and so on according to the working principle. The internal combustion engine mostly uses the DC starter, which is characterized by compact structure, simple operation and easy maintenance. Gasoline starter is a small gasoline engine with clutch and variable speed mechanism, which has high power and is less affected by temperature, can start large internal combustion engine, and is suitable for alpine zone. Compressed air starter is divided into two categories, one is the compressed air in accordance with the order of work into the cylinder, one is the use of pneumatic motor drive flywheel. The use of compressed air starters is close to that of gasoline starters and is commonly used for the start-up of large internal combustion engines.