Booking Car Using App （BCUA）is developing rapidly. The Company （Uber and Didi）put a lot of resources to compete in Beijing Traffic Market. Based on the background of BCUA，this report analyzes basic situation of BCUA，including financing，supervision，partners，and comparison with traditional taxi. In addition，this report also uncovers subsidy incentive mechanism and its consequences of BCUA. From re-allocate traffic resources，changing travel mode，strengthening supervision，forcing taxi reform，returning appropriate profit etc.，this report proposes some suggestions on promoting the development of BCUA in Beijing.