Chinese foreign ministry spokesman Lu Kang said a one-day extension in talks showed both sides are serious about the talks.
Trade talks in Beijing between the world's two biggest economies entered the third day on Wednesday, amid signs of progress on issues including purchases of United States farm and energy commodities and increased U.S. access to China's markets.
World markets rose on increasing optimism that the two sides would be able to hammer out a deal ahead of a March deadline and avert further import tariff hikes.
They agreed to maintain close contact, the statement said.
Negotiations between USA and Chinese trade officials, which began Monday in the Commerce Ministry in Beijing, finally concluded on Wednesday as both sides sought to inch closer to an understanding on a number of disagreements.
U.S. officials also conveyed Trump's commitment to address his country's trade deficit with China and to resolve structural issues to improve trade between both countries, according to the USTR.
While signals from the latest round of talks were upbeat, if a deal is not reached by March 1, the United States side may follow through on raising tariffs on US$200 billion in Chinese goods from 10 per cent to 25 per cent.
China and the United States concluded three days of talks by midlevel trade officials January 9 with a cautious sense of optimism that the world's two biggest economies might be able to reach a deal that ends their bruising trade war.
The United States and China on Wednesday concluded three days of extended talks to resolve their trade war, with a member of the American delegation saying negotiations "went just fine". The U.S. and China have slapped a tariffs on a combined $360 billion in each other's imports since July.
The oil price jumps were in line with Asian stock markets, which climbed to 3-1/2 week highs on Wednesday.
Companies, disappointed that Beijing hasn't kept past commitments, also want any deal to ensure that China faces "some kind of penalty for not doing what they promised", Parker said. "If the results of the talks are positive, it would be beneficial for both China and the USA and it would be good news for the global economy". "Neither side has made a briefing, because the US delegation is on the plane now", wrote Hu Xijin, editor of the Global Times, published by the ruling Communist Party's official People's Daily.
Officials discussed the need for any deal to include "ongoing verification and effective enforcement".
US President Donald Trump and China's President Xi Jinping.
"Talks with China are going very well!".
China says it is trying to protect its own economic interests and has accused the USA of violating global trading rules.
As the trade talks wound down, China's top economic official, Premier Li Keqiang, met with CEO Elon Musk of electric vehicle brand Tesla Inc. The mid-level talks were the first face-to-face meeting between the two sides since their leaders met on 1 December 2018.
USA companies also want action on Chinese policies they complain improperly favor local companies.
There was little market reaction to Trump's prime-time televised address where he made his case that a U.S. -Mexico border wall is urgently needed, despite opposition from Democrats.
U.S. Undersecretary for Trade and Foreign Agricultural Affairs Ted McKinney walks into a hotel after a second day of meetings with Chinese officials in Beijing, Tuesday, Jan. 8, 2019.
For its part, Beijing is unhappy with USA export and investment curbs, such as controls on "dual use" technology with possible military applications.