In　this　paper,　a　measure　model　of　diversification＇s　synergistic　degree　is　established　based　on　the　theory　of　synergistic　effect.　And　the　development　of　diversification＇s　static　and　dynamic　synergy　in　Midea,　which　is　a　listed　Chinese　household　appliance　corporation,　is　analyzed　with　the　annual　financial　statement　data　from　2002　to　2007　by　using　the　method　of　Principal　Component　Analysis　and　Regression　Analysis.　The　result　shows　that　due　to　the　complexity　of　diversification＇s　synergy　in　corporation,　the　degree　of　synergistic　effect　between　Midea　Household　Appliance　and　its　diversification　business　decreases　firstly　and　increases　afterwards,　which　indicates　that　its　development　is　not　always　on　the　track　of　harmonious　development.　The　paper　has　provided　new　thoughts　and　analytical　approach　to　the　problem　of　analysis　and　evaluation　of　the　diversification＇s　synergistic　effect　in　diversified　corporation.