In order to reach the goal of "integrating air and space, capale of offense and defense,” the PRC have actively involved in the research and development of unmanned combat vehicles. To date,Yi-Long I and II,Cloud Shadow,Wind Shadow,Shenlong space shuttle and hypersonic cruise missiles have been completed test flight,and has threatened my air defense early warning and missile defense capabilities. This article starts from the PRC modernization trend, especially focus on it’s UCAV’s current development, capability, tactics and future trends, and furthermore discuss the background and evolution of each development stages, analysis on PRC’s UCAV development, current status and benefit assessment. The main objective of this thesis is to discuss and evaluate the potential impacts of PRC’s UCAV development over Taiwan Strait, and lastly come up with our strategic planning and countermeasures.