Changcheng technology is a high-tech enterprise which is mainly engaged in the development and production of optical fiber optic cable, fiber optic jumpers and optical devices. The company introduces Swiss, United States and domestic advanced production equipment and the Canadian EXFO company dispersion strain tester; Single mode, multimode OTDR; High and low temperature detection equipment, the establishment of the full performance testing center, can provide the users with various types of high quality optical fiber and optical devices. The company passed the ISO9001 (2000 edition) international quality system certification in 2001, and the products were inspected by the quality supervision and inspection center of the ministry of information industry of the ministry of information industry, and all the indicators reached the national standard.