The Hang Seng Index gained 533.78 points, or 2.21 percent, to open at 24,679.35 on Tuesday.

The Hang Seng Tech Index, which represents the 30 largest technology companies listed in Hong Kong, climbed over 3 percent shortly after the opening.

US stocks gained for a second straight session overnight as investors sought bargains after US stocks recently hit a technical correction, described as a drop of 10 percent from a market high. (with additonal reporting from Xinhua and AFP)