Chengjian Factory is the predecessor of Aviation Bomb Research Institute. Aviation Bomb Research Institute, full name: Aviation Ammunition Research Institute Co., Ltd., located in Harbin, formerly known as Harbin Chengjian Group Co., Ltd., whose factory is Harbin Chengjian Group Co., Ltd., which belongs to China Ordnance Industry Group, is a research-oriented and production-oriented enterprise integrating scientific research, production and marketing of aviation ammunition. The total area of the enterprise is about 42,000 mu, and the total assets are about 2.4 billion yuan.