The traditional Tactical Internet (TI) simulative training didnt consider the terrain environment and maneuver simulation, so its fidelity was low. The paper aimed to resolve it. Firstly, the paper gave the modeling process of TI terrain environment, and put forward the corresponding ways to some parts of the modeling process. Secondly, the paper gave the optimization steps of TI terrain model, it improved the simulation running efficiency; and then the paper utilized the large area database management technique to solve dynamic loading and rendering problem of large terrain model. Lastly, the paper gave the maneuver simulation way to the communication vehicles of TI, it solved the problems of maneuver collision and precise maneuvering along the road. The paper presented the realization results in each part, and it proved the effectiveness of the given ways.