The large-cap CSI300 Index .CSI300 closed down 0.6%, while the Shanghai Composite Index .SSEC fell 0.4%.
In Hong Kong, the Hang Seng Index .HSI dropped roughly 1%.
Trade tensions and sector moves
U.S. President Donald Trump and Chinese leader Xi Jinping will meet on Sept. 24. The main focus is whether they will signal an extension to a trade truce struck last year that averted a major shock to the global economy.
The planned meeting "is a sign the U.S.-China relationship is becoming more predictable,” Oxford Economics said in a report.
“However, trade, technology, and security policies are likely to stay on a structurally more restrictive path,” the think tank said, forecasting “a calmer, but not closer, relationship.”
The European Central Bank on Tuesday said China's industrial transformation was squeezing European firms out of global markets.
Rating agency Fitch said that China's trade shock has affected the euro zone, particularly export-oriented Germany.
It lowered China’s 2026 growth forecast by 0.1 percentage point to 4.5%, citing its increasing economic imbalances.
An index tracking China’s carmakers .CSI931008 fell 0.3% as some European auto executives and politicians have called for local content rules and expanded tariffs to curb vehicle sales from China. An index of China’s new energy vehicles declined 0.7%.
Meanwhile, a rebound in tech shares .STAR50.HSTECH lost steam in both China and Hong Kong.
Property shares .CSI000948 in both markets rose .HSMPI after a Reuters report that Chinese regulators asked some banks not to classify overdue loans to China Vanke 000002.SZ as non-performing and extend repayment deadlines for the state-backed developer.
Stocks fall as investors temper meeting hopes
SHANGHAI, Sept. 23 (Reuters) - China and Hong Kong stocks declined on Wednesday, as investors tempered expectations for an upcoming meeting between the U.S. and Chinese presidents, while rising trade tensions with Europe weighed.
The real estate sector, however, advanced amid signs of fresh government support.
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