China flags counter-measures to US tariffs

China has to take necessary counter-measures to the latest US tariffs on $US300 billion ($A443 billion) of Chinese goods, the finance ministry says.

The ministry also said the US tariffs violate a consensus reached by the leaders of the two countries and go off the right track of resolving disputes by negotiation.

The United States said early this month it would slap duties on $US300 billion of Chinese goods from September 1, which would effectively cover all of China's exports to the United States.

But President Donald Trump backed off part of the plan on Tuesday, delaying duties on some of the items on the list such as mobile phones, laptops and other consumer goods, in the hopes of blunting their impact on US holiday sales.

Tariffs will still apply to those products from mid-December.