In　this　paper,　the　entropy　measure　is　used　to　define　the　models　of　diversification　initially.　According　to　the　division　of　diversification　by　entropy　measure　and　the　Rumelt＇s　classification　model　for　diversification,　we　can　make　quantitative　researches　of　diversification,　and　get　the　nine　models　of　diversification　by　matrix　method.　Based　on　above　works,　it　could　help　to　define　the　evolutional　models　of　diversification　according　to　the　data　of　sixty　listed　firms,　and　also　the　evolvement　rule　about　the　different　stages　in　the　process　of　diversification　of　Chinese　large-sized　firms.　The　research　results　can　offer　reliable　decision-making　foundation　for　the　diversification　selection　of　Chinese　firms.