In a statement, the Chinese Commerce Ministry charged that the United States "once again put domestic law above global law by imposing "very unreasonable" new tariffs on Chinese goods". Chinese imports worth $34 billion would be subject to the new 25% tariff as of July 6, with another $16 billion worth of imports subject to the tariff at a later date.China retaliateswith an equivalent set of tariffs. In April, the administration had announced plans to slap tariffs on 1,333 Chinese product lines worth $50 billion a year.
The Trump administration announced an expected second, $16 billion tranche of tariffs on Chinese goods Tuesday, bringing the total amount of Chinese exports subject to new US tariffs to $50 billion.
Customs officials will begin collecting the border tax August 23, the Office of the U.S. Trade Representative says.
Last year, China imported about $130 billion of US goods. President Donald Trump has suggested he may tax effectively all imports of Chinese goods, which reached more than $500 billion previous year.
U.S. president Donald Trump has threatened to target all $500bn of Chinese imports.
The 25% import taxes will apply to about $16bn (£12b.3bn) worth in annual imports, covering about 280 items, including chemicals and machinery.
Trump has threatened to levy a 25% tariff on an additional $200 billion worth of Chinese imports to the USA - a move that would blow open the disagreement between the countries.
After a strong start to the year, growth in the world's second-largest economy cooled slightly in the second quarter, partly hit by the government's years-long efforts to tackle debt risks.
The government has responded by releasing more liquidity into the banking system, encouraging lending and promising a more "active" fiscal policy.
The investigation had revealed that China uses joint venture requirements, foreign investment restrictions, and administrative review and licensing processes to require or pressure technology transfer from United States companies and it deprives U.S. companies of the ability to set market-based terms in licensing and other technology-related negotiations.
Imports grew 27.3 percent in July, customs said, beating analysts' forecast of 16.2 percent growth, and compared with a 14.1 percent rise in June.
China's surplus with the United States shrank marginally to $28.09 billion last month from a record $28.97 billion in June.
China fired back with its own warning and said it would impose duties on $60 billion of U.S. goods. Washington has long criticised China's trade surplus with the United States and has demanded Beijing cut it.
Mr Trump has said he would be willing to hit all of China's imports with duties.
It has not yet given a date for its previously announced retaliatory tariffs on $16 billion in USA goods, which will target commodities such as crude oil, natural gas, coal and some refined oil products.