As active promotion of the construction of 3 million square kilometers ocean territory in China

the design of ultra-low-energy buildings in ocean areas has attracted more and more researchers' attention. To investigate the scientific accuracy of climate partition in ocean areas

the article firstly analyzed the climatic characteristics in ocean areas from two different angles—climate comparisons between sea and land

as well as among different sea regions

and then determined the climate partition of inland cities and island counties (or ocean island-reefs) according to current climate zoning standards. The results presented the wide differences between sea and land

which were reflected in the aspects of CDD26

daily temperature range and wind speed. The diversities for CDD26

annual temperature range and solar radiation vary in different sea regions. Additionally

building climate partition standard performed by our countries now is inapplicable for ocean areas. Therefore

it's necessary to establish building climate partition for ocean areas which is distinguished from the inland areas

and the south sea region is more complex than north or east sea regions. This study can prompt ocean areas to form scientific climate partition

and lay a theoretical foundation for the indoor thermal comfort research and the design of ultra-low-energy buildings in ocean areas.