Suzhou Marine Machinery Co., Ltd has a history more than 35 years, which manufactures marine special propulsions, such as rudder propeller, controllable pitch propeller and tunnel thruster (CPP and FPP). It is a designated manufacture enterprise by original CSSC and army. It has produced about 800 sets of various propulsions that have been mentioned above since it founded. These propulsions have been used in various militaries and civil ships. In the 1980s, SMMC imported the special propulsion technology from western celebrated corporations. This makes it become the professional enterprise which is famous for its products, variety and long history of the manufacture of special propulsions in China.