Trade talks between the United States and China should be equal and mutually beneficial, Chinese Vice Commerce Minister Wang Shouwen has said, adding that he hoped the two countries can find ways to manage their differences through dialogue.

US President Donald Trump and his Chinese counterpart Xi Jinping are expected to hold talks during the G20 summit in Buenos Aires next week as trade ties between the world's two largest economies become increasingly fraught.

"We hope that, on the basis of equal consultations, mutual benefits and trust, we could make common efforts to manage differences and find ways to resolve problems," Wang told a news conference in Beijing, the capital.

Officials of both countries were in close contact, instructed by their leaders, he added.

Washington wants Beijing to improve market access and intellectual property protections for US firms, cut industrial subsidies and slash a $375-billion trade gap.

Mr Trump has imposed tariffs on $250 billion of Chinese imports to force concessions.

The US tariff rate on $200 billion in Chinese goods is set to increase to 25% from 10% on 1 January.

Mr Trump has threatened to impose tariffs on all remaining Chinese imports - about $267 billion more in goods - if Beijing fails to address US demands.

Mr Trump said yesterday he hoped he could make a deal with China when he meets Mr Xi.

"I can say this, China wants to make a deal very badly - because of the tariffs," Mr Trump told reporters in the town of Palm Beach in Florida.

"China wants to make a deal; if we can make a deal, we will," he said.

The high-stakes meeting comes as the Trump administration shows little sign of backing down in its demands and rhetoric.

Washington said on Tuesday China had failed to alter its "unfair" practices at the heart of the dispute, in an update of the US Trade Representative's "Section 301" investigation into its intellectual property and technology transfer policies.