In this paper, the modern development of navigation positioning and time-synchronization technology base on tactical information network are introduced, aiming at requirements for high precision space-time synchronization information of multiple-platform joint operations in modern war, the system architecture of navigation positioning and time-synchronization based on tactical information network are designed, a dual-gird Integrated navigation technical system are proposed, and key technologies are analyzed. Thus, the navigation positioning and time-synchronization function could independent from ground benchmark or satellite navigation system, while offering a high efficient use of the absolute position existed in the network, which enhanced the adaptability for complex battlefield.