"The land reclamation project of China's construction on some stationed islands and reefs of the Nansha Islands, as planned, will be completed very soon," Chinese foreign ministry spokesman Lu Kang said here.
The Spratly islands which China calls the Nansha islands in the South China Sea (SCS), are also claimed by the Philippines and Vietnam.
The obligations and responsibilities highlighted by him included maritime search and rescue, disaster prevention and mitigation, marine scientific research, meteorological observation, ecological environment conservation, navigation safety as well as fishery production service.
After the land reclamation, China will start the building of facilities to meet relevant functional requirements, Lu said in a statement earlier.
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He justified the construction saying that the building activities are "lawful, reasonable and justified" as the islands and reefs are within China's sovereignty.
Reiterating US concerns about tensions in the SCS, Carter called on China and all rival claimants to halt land reclamation and militarisation of disputed territory and to pursue a peaceful resolution in accordance with international law, a Pentagon statement said.
China's claim of sovereignty over almost all of SCS is hotly contested by Vietnam, the Philippines, Malaysia, Brunei and Taiwan.
The US, India and other countries have been stating that the disputes should not hinder the freedom of navigation in SCS which is a busy international shipping trade route.
In his statement today, Lu said China will continue to uphold the freedom of navigation as well as peace and stability in the South China Sea.
The land reclamation projects are not targeted at any other country, do not affect the freedom of navigation and over flight enjoyed by all countries in accordance with international law in the SCS, he said.
"Nor have they caused or will they cause damage to the marine ecological system and environment in the SCS and are thus beyond reproach," Lu said.