In　this　study,　an　analytical　framework　of　the　object　business　selection　for　corporate　diversification　is　established　based　on　the　theory　of　grey　correlation.　And　the　resource　dependency　for　corporate　diversification　is　analyzed　by　combining　Fuzzy　Comprehensive　Evaluation　with　Grey　Multi-hierarchal　Synthetic　Evaluation　Model.　In　addition,　the　calculation　model　of　synergistic　degree　is　built　to　verify　the　gray　correlation.　The　result　shows　that　the　grey　correlation　between　surplus　resources　possessed　or　needed　by　the　corporations　and　the　resources　needed　or　possessed　by　the　object　business　are　positively　correlating.　It　will　improve　the　synergistic　effect　and　finally　increase　the　successful　rate　when　the　corporations　select　the　object　business　in　which　the　resources　have　the　high　grey　correlation　with　the　surplus　resources　possessed　or　needed　by　corporations　themselves.　©2009　IEEE.