The　paper　addresses　two　interrelated　issues　to　analyze　the　recent　phenomena　of　＇Beijingnalization　of　R&D＇,　which　are　the　decentralization　of　R&D　and　regional　agglomerations　of　R&D.　Three　types　of　motivations　are　concluded　to　describe　the　determinant　of　decentralization　of　R&D.　On　a　micro　level,　＇locational　decision　model　of　decentralized　R&D　units　of　corporation＇　(LDM)　is　offered　to　help　the　mother　corporations　in　locational　decision　of　their　decentralized　R&D　units.　On　a　meso　level,　a　＇regional　attraction　model　of　host　region　to　its　R&D　affiliates＇　(RAM)　is　proposed　to　assess　the　regional　attraction　to　the　decentralized　R&D　units.　Beijing　City　as　host　region　and　its　R&D　affiliates　are　chosen　as　research　objects.　Results　support　that　a　region　with　technology　advancement　and　clusters　of　specific　industry　will　attract　more　decentralized　R&D　affiliates.　The　evaluation　of　the　attraction　of　Beging　shows　that　it　is　relatively　attractive　to　the　decentralized　R&D　units,　while　it　has　its　own　advantages　and　disadvantages.　The　government　should　pay　more　attention　to　improve　the　industrialization　capabilities　of　Beijing　and　to　establish　more　attractive　innovation　policies.　©　2006　IEEE.