Data from the General Administration of Customs showed on Wednesday that exports advanced 12.2 percent year-on-year in July.
The world's two biggest economies are caught up in a trade dispute over Washington's allegations that China uses predatory tactics, including outright cybertheft, in a drive to supplant USA technological supremacy.
Analysts were split on how much effect the tariffs had on July's reading.
The latest duties target 279 tariff lines that include several industrial products.
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"Equally though, this may reflect a broader softening in economic momentum among developed economies given that exports to the European Union edged down too".
China and the United States are locked in an increasingly bitter trade war, with Washington set to begin collecting 25 percent tariffs on another $16 billion in Chinese goods on August 23, the latest move by President Donald Trump to put pressure on Beijing to negotiate trade concessions.
Beijing has called on U.S. officials to be "cool headed", but has warned it will retaliate to any tariffs with its own measures. U.S. officials said there were 279 new goods to be targeted in the latest round of tariffs, including motorbikes, tractors, railroad parts, electronic circuits, motors and farm equipment. China has vowed to retaliate to an equal degree.
Beijing has already threatened to retaliate against United States products in kind, warning Washington against "blackmailing and pressuring".
But there seems no solution at sight as the Trump administration prepares for tariffs of up to 25 per cent on an additional Dollars 200 billion in Chinese products.
Washington and Beijing are locked in battle over American accusations that China's export economy benefits from unfair policies and subsidies, and especially from the theft of American technological know-how. This was faster than the 10 percent rise economists had forecast.