Liu will visit Washington on Jan. 13-15, said Gao Feng, spokesman at the commerce ministry.
Negotiating teams from both sides remain in close communication on the particular arrangements of the signing, Gao told reporters at a regular briefing.
U.S. President Donald Trump said on Dec. 31 that the Phase 1 deal with China would be signed on Jan. 15 at the White House. Trump also said he would sign the deal with "high-level representatives of China", and that he would later travel to Beijing to begin talks on the next phase.
The United States launched a trade war against Beijing a year and half ago over allegations of unfair trade practices, such as theft of U.S. intellectual property and subsidies that unfairly benefit Chinese state-owned companies.
The Phase 1 deal reached last month is expected to cut tariffs and boost Chinese purchases of U.S. farm, energy and manufactured goods while addressing some disputes over intellectual property.
But no version of the text has been made public, and Chinese officials have yet to publicly commit to key points such as increasing imports of U.S. goods and services by $200 billion over two years.
China will not increase its annual low-tariff import quotas for corn, wheat and rice to accommodate stepped-up purchases of farm goods from the United States, senior agriculture official Han Jun said on Tuesday, according to local media group Caixin.
The move could make it harder for Beijing to meet import commitments in a Phase 1 trade deal due to be signed next week. U.S. President Donald Trump said last month the agreement would likely double China's $24 billion in pre-trade war purchases to $40-$50 billion annually.
When asked if China would have to reduce grain imports from other countries in order to meet its U.S. commitments, Gao said that China will continue to improve the administration of tariff quotas for wheat, corn and soybeans in accordance with WTO commitments, and will make full use of quotas according to market conditions.
This is not inconsistent with expanding agricultural imports from the United States, said Gao.