Beijing Twenty-first Century Science and Technology Development Co., Ltd. (21 STC), which was founded in March 1992, has been approved as high and new technology enterprise in the Beijing New Tech-industry Development Zone. The company has persisted in the business strategy integrating technology development, production and trade which takes self-owned technologies as the core and self-owned brands as the principal brands. Its business scope covers the development and sale of radio test systems, industrial automating control systems and integrated systematic engineering. Our managing idea is small entity, big network. The company undertaking the pragmatic and innovative policy has realized the stable and sustainable development achievements.