Situation on the South China Sea has become more and more complex in 2015.Some Southeast Asian claimants to the South China Sea have dramatically strengthened “right-defending” actions. Maritime security cooperation among the ASEAN countries，US and Japan will be sustained and deep. Now ASEAN’s development is facing both new challenges and opportunity. Because of the US and Japan’s deeply intervention in the South China Sea，and the intense international legal struggle correlated with rights and interests in the region，the South China Sea issue has undergone dual qualitative change. The adjustment of ASEAN countries’s South China Sea policy are both driving forces and results of change on the South China Sea. The change on the South China Sea might implicate more risks and challenges for China’s “right-defending” road on the sea. China must stick to its two tracks of thinking and maneuver his relationship with both ASEAN countries and ASEAN in dealing with the South China Sea issue.