The defence ministry spoke out as tensions rose between the two powers over reports that Beijing has deployed surface-to-air missiles, fighter jets, and radar installations in the contested region.
"The US is truly the one pushing militarisation in the South China Sea," said ministry spokesman Wu Qian at a regular monthly briefing.
"China's building of defence facilities on the South China Sea islands and reefs is absolutely necessary."
Beijing claims almost the whole of the South China Sea -- through which a third of the world's oil passes -- while several other littoral states have competing claims, as does Taiwan.
A US official told AFP that Beijing has deployed surface-to-air missiles on Woody Island in the disputed Paracels chain -- apparently HQ-9s, which have a range of about 200 kilometres.
Citing two unnamed US officials, American broadcaster Fox News said Tuesday that US intelligence services had spotted Chinese Shenyang J-11 and Xian JH-7 warplanes on the same island.
The United States has in recent months sent warships to sail within 12 nautical miles -- the usual territorial limit around natural land -- of a disputed island and reef transformed into an artificial island in what it says is a defence of the right to free passage.
Chinese foreign minister Wang Yi on Thursday concluded a visit to the US for talks with US secretary of state John Kerry, who told reporters last week: "There is every evidence, every day, that there has been an increase of militarisation of one kind or another. It's of a serious concern.
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