Hong Kong stocks closed up more than six percent on Wednesday as developers soared higher after China unveiled a raft of measures to boost its economy, particularly the troubled property sector.

The Hang Seng Index climbed 6.2 percent, or 1,310 points, to 22,443.

Turnover reached HK$434 billion.

Traders in the city and on mainland bourses have been rushing to snap up stocks since China last week began unveiling measures aimed at kickstarting the country's struggling economy, with an emphasis on real estate.

Beijing last week began announcing moves to revive the sector including interest rate cuts, help for mortgage holders and easing of home-buying rules.

Developers led the rally in Wednesday's surge, with Agile Group leaping 160 percent higher, Sunac China Holdings rocketing more than 75 percent and Fantasia Holdings up 118 percent.

However, the firms' valuations are still a fraction of what they were three years ago.

Tech firms were also well bought, with e-commerce giant JD.com rallying close to 11 percent, Meituan piling on more than 14 percent and market heavyweight Alibaba adding nearly four percent.

Markets in Shanghai and Shenzhen were closed for a week-long holiday. (AFP)