The SCO member states no longer adapt themselves to the important changes in both internal external environments：there are increasingly structural conflicts in regard of the SCO’s developmental mode，making its single connotative development increasingly difficult；the threat to intra-area security out of external sources is hard to get rid of，making it impossible for the SCO to radically solve the problems of stability and security. The Eastern move of US strategic pivot improves the SCO’s strategic value to China；and the excessive expansion of international monopolized capital provides opportunities for the SCO to drive to establish a just and reasonable new world order. The SCO’s addition of memberships is significant for China to plan on the development of its western region，facilitating the building of the U-shaped good neighborly cooperation with China and Silk Road Economic Zone，and solve Afganistan’s problems. The SCO’s expansion of memberships，however，requires taking tactic consideration，working out plans and a road map in advance without damaging the core interest of its present member states as a prerequisite，adopting measures to keep on its operational efficiency，and maintaining basic consensus on important international and regional issues.