Climate change causes sea level rise, which may lead to coastal erosion and inundation of marine features. Countries actively address the changes in baselines and coastal zone boundaries resulting from sea-level rise through protecting physical coasts with hard engineering, infrastructure rehabilitation, sediment protection, ecosystem restoration such as mangroves, reclamation and artificial island construction practices. According to the provisions of international law, the artificial protection of coastline is a recognized practice. Nevertheless, coastal countries should also pay attention to the principles of international law to ensure that their maritime rights are legitimately and reasonably protected without harming the interests of other countries. When dealing with sea level rise, China should use legal and effective artificial coastal protection measures to safeguard maritime rights and interests, make reasonable use of land reclamation, carry out legal island construction and protection activities, establish and improve the mangrove restoration guarantee system, properly deal with the impact of sea level rise on maritime boundaries, as well as strengthen international cooperation in response to sea level rise.