China’s ambassador to the United Nations, Zhang Yesui, has said the time is not right to consider more sanctions against Iran.
The UN Security Council, including China, has previously called for Iran to stop enriching uranium and has issued three sets of sanctions.
Iran’s leaders insist their atomic programme is only meant for energy-generating purposes.
But the US and its allies fear Iran is trying to develop nuclear weapons.
China has the presidency of the UN Security Council during January, and is one of its five permanent veto-holders.