A translation of the text to Chinese was still being completed late on Tuesday,as Liu met with US Trade Representative Robert Lighthizer.
Trump has already begun touting the trade deal as a centrepiece of his 2020 re-election campaign,calling it"a big beautiful monster"at a rally in Toledo,Ohio last week.
"Our farmers will take it in. I keep saying,'Go buy larger tractors,go buy larger tractors,'"Trump said.
The centrepiece of the deal is a pledge by China to purchase an additional $US200 billion ($290 billion) worth of US goods over two years to cut a bilateral US trade deficit that peaked at $US420 billion in 2018.
A source briefed on the agreement told Reuters that China will purchase an additional $US80 billion worth of US manufactured goods over the two year period,including aircraft,autos and car parts,agricultural machinery and medical devices.
Beijing will boost energy purchases by some $US50 billion and services by $US35 billion,while agricultural purchases will get a $US32 billion lift over the two years,all compared to a 2017 baseline of US exports to China,the source said.