The CSI 300 Index dropped 0.4 per cent to 3,758.19 at the trading break, trimming the weekly gain to 0.3 per cent. The Shanghai Composite Index also fell 0.4 per cent.
Hong Kong’s market closed for a public holiday on Friday.
The nation’s biggest companies mostly traded lower. Kweichow Moutai, the world’s most valuable liquor maker, eased 0.4 per cent to 1,563.18 yuan. Coal producer China Shenhua Energy lost 0.7 per cent to 39 yuan and electric-vehicle maker BYD slid 1.3 per cent to 345.05 yuan.
US President Donald Trump said on Thursday that China and the US were engaged in trade talks, but he gave no evidence of any progress.
In another sign of escalating tensions between the two nations, the US Trade Representative’s Office said that Chinese-owned or Chinese-built ships would be required to pay fees for docking at US ports, with charges increasing over time based on the vessel’s size and cargo.