The granular principles of exploratory analysis model was investigated, a granular computing-based exploratory model was constructed for the measurement of command and control system effectiveness. The paper focused on model construction, granular acquisition and attribute function formation in the exploratory model. For the minimizing of the mission completion time, the exploratory analysis experiment was designed, with reference to cases of multi-branch joint operations. The exploration shows that the exploratory analysis modeling based on granular computing can reduce the complexity by granular conversion and keep consistency of problem description on different granular levels.