Coastal China seas are rich in habitats，species diversity and marine productivity，which is significant for the coastal areas’ sustainable economic development. Over the past decades，coastal China seas have been heavily impacted by the climate change. However，the understanding and strategies for the climate change and human activities in this region are still relatively poor compared with that in the land areas. In past recent decades，the sea surface temperature and sea level in the coastal China seas were warming at a rate of 0.015℃/year and rising at a rate of 3.0 mm/year respectively，both of which were greater than that of the global one. The marine ecosystem in the coastal China seas experienced obvious inter-decadal anomalies due to the influence of climate change. Except that，with the rapid socio-economic development in the coastal areas，the health and services of marine ecosystem face the increasing intervention from human activities such as the reclamation，sewage discharging and overfishing；and which contributed to an increasing climate-related vulnerability in the marine ecosystems，e.g.，the changes in marine bio-geographical distributions，frequent occurrences of harmful algal blooms（HABs）and enteromorpha（green tide），decline of dissolved oxygen content. It is therefore urgent to mitigate and address to climate change risk in the coastal China seas.