Rapid socio–economic development leads to a great increase in water demand of many sectors and conflicts between water users. Moreover, studies have warned about serious degree of influence of climate change (CC) on Vietnam, particularly on the water resources. Therefore, assess CC impacts on water balances are very necessary task. The Ministry of Natural Resources and Environment has completed the appropriate climate change scenarios in Vietnam [1]. In this study, water balance results will be presented including three scenarios: high emissions scenario (A2), medium emission scenario (B2), and low emission scenario (B1). The water balanced in.