At close of trade, the benchmark Shanghai Composite Index was down 0.67%, or 21.87 points, to 3,226.82. The Shenzhen Composite Index, which tracks stocks on China's second exchange, dropped 0.95%, or 19.91 points, to 2,076.51. The blue-chip CSI300 index dropped 0.54%, or 21.80 points, to 3,986.89.