1. After reforming and open up, the national power of Vietnam is obviously getting rise. The attitude to develop South China Sea is more and more active. Vietnam has put more and more effort to its Navy and as a backup. Those actions complicate the various situations in the South China Sea.2. Vietnam, The eight, is officially confirmed the ”Strategy of ocean” which are national security with the potential development of ocean, the development of social economy and defend the motherland ocean. The strategy of ocean makes Vietnam investing more money to get newest warships and pressured into the nations nearby.3. The ”Declaration on conduct of parties in the South China Sea”, the signatories of the declaration on the content of behavior contrary. The dispute in the South China Sea is still unresolved and getting worse.