This paper introduce the design of tacsat-1 satellite system, which is proposed by OFT (Office of Force Transformation) of DoD (the Department of Defense), in terms of tactical application, technical features, key products and systems. This paper briefly describes the combined operational tactics of the satellite system in the context of network centric warfare. This paper inroduces the technical characteristics of the satellite system adapting to tactical application design, such as satellite-to-ground network, electronic & communication payload and optical load. Finally, the sum-up for development and application of tactical micro-satellite system is summed up blocking, universal, roboticized design of the satellite, network of joint operations, machine to machine autonomous cooperation, low discount and applied design of payload and so on.