Modeling analysis technique is one of the most important means in processing spaceflight mission. In this paper, the graph based description is given, and a series of dynamic-measurement system models are built for the attitude motion of a N-bodies spacecraft, which include the states evolvement equation of the main body, the states evolvement equations of the accessories, the inertia based measurement equations and the celestial bodies based measurement equation and the GPS based measurement equations of attitudes of the N-bodies etc.. These models are educed with some typical methods of theoretical analysis and dynamic description and are simplified into linearized discrete equations. At the end of the paper some valuable applications are pointed out.