China's Shanghai Composite Index opened up 4.11 points on May 20 (Tuesday), an increase of 0.12%, at 3371.69 points; China's Shenzhen Component Index opened up 11.16 points on May 20 (Tuesday), an increase of 0.11%, at 10182.25 points; China's CSI 300 Index opened up 5.96 points on May 20 (Tuesday), an increase of 0.15%, at 3883.1 points; China's ChiNext Index opened up 8.74 points on May 20 (Tuesday), an increase of 0.43%, at 2041.5 points; China's Science and Technology Innovation 50 Index opened up 0.5 points on May 20 (Tuesday), an increase of 0.05%, at 995.75 points.