BeiDou Navigation Satellite System is the Chinese satellite navigation framework. The BDS gives all-time, all-climate and high-accuracy positioning, navigation and timing services to worldwide clients. China began to explore a path to develop a navigation satellite system reasonable for its public conditions. It gradually formed a three-step development system. That are; the development of BDS-1 was completed to offer services to China, by 2000; the development of BDS-2 was completed to offer services to the Asia-Pacific region,by 2012; the development of BDS-3 will be completed to offer services worldwide in 2020.