Territoriality-based collaboration is one of the ways to realize situation awareness in tabletop collaboration. Thus the implementation pattern of territoriality-based collaboration was proposed, and three territorialities i.e. storage territory, private territory, public territory, were described. The realization mechanism of territoriality-based collaboration was given afterwards, including multi-touch points management, display management and conflict processing mechanism. Finally, situation awareness platform using territoriality-based collaboration was implemented, whose performance was verified through user testing experiments. 