Based　on　the　evolutionary　game　theory,　this　paper　mainly　analyzes　the　formation　of　innovation　networks,　and　discovers　the　formation　rule　of　innovation　networks,　then　finds　the　key　factors　which　affect　the　formation　of　innovation　networks.　The　result　shows　that　evolutionary　game　promotes　the　formation　of　innovation　networks.　One　of　the　key　factors　which　affect　the　formation　of　innovation　networks　is　the　ability　of　absorbing　and　transforming　the　innovation　knowledge,　and　another　is　the　environment　of　networks.　Consequently,　this　paper　offers　valuable　help　for　the　key　innovation　agents　including　enterprises,　universities　or　research　institutes,　intermediary　organizations　and　government　agencies　to　improve　innovation　efficiency.