Beijing has said it will respond in kind if President Trump imposes higher tariffs on Chinese goods on Friday.
The Chinese Commerce Ministry said that if the US tariff measures are implemented, it would take “necessary countermeasures”.
The warning comes as US and Chinese officials prepare to meet over the next two days.
On Wednesday President Trump tweeted that Vice Premier Liu He “is now coming to the U.S. to make a deal. We’ll see.”
On Sunday Mr Trump said on Twitter the US would more than double tariffs on $200bn (£152bn) of Chinese goods on Friday and could introduce fresh tariffs.
US trade representative Robert Lighthizer later accused China of backtracking on commitments in trade talks.
However, he insisted a deal with Beijing was still possible.
The US stock market is down over 2% since Sunday but did not react to the comments on Wednesday from China.
