In order to meet the requirements of multiple data links cooperative combat in network centric battle field, we analyzed the problems and challenges that US Army tactical data link system encountered when meeting the needs of network-centric warfare, and elaborated the turning point that the ideas of cloud computing service mode construct the networking data link system in network-centric battle field. On the basis of this, we put forward a new battlefield-oriented, demand-based, real-time serviced networking data link system---the joint data link system based on cloud computing, and proved that the use of cloud technology in Joined Data Links can improve the system service level markedly.