The Hang Seng Index rebounded by 1.77 percent, or 480 points at 27,705 points, as of midday.
The mainboard turnover was about HK$76.92 billion.
Among blue chips, Xinyi Solar (0968) was the top gainer, whose shares jumped by 5 percent, at HK$15.90.
However, CSPC Pharmaceutical (1093) fell by 1.5 percent, at HK$10.5, the biggest loser.
The SSE Composite Index gained by 0.33 percent, at 3,574.30 points. Shenzhen Composite Index edged up by 0.19 percent, at 2,497.15 points.