Chinese President Xi Jinping's mantra that homes should be for living in is falling on deaf ears, with tens of millions of apartments and houses standing empty across the country.

Soon-to-be-published research will show roughly 22 per cent of China's urban housing stock is unoccupied, according to Professor Gan Li, who runs the main nationwide study. That adds up to more than 50 million empty homes, he said.

There are developments completed across China with few residents. Credit:Bloomberg

The nightmare scenario for policy makers is that owners of unoccupied dwellings rush to sell if cracks start appearing in the property market, causing prices to spiral. The latest data, from a survey in 2017, also suggests Beijing's efforts to curb property speculation - considered by leaders a key threat to financial and social stability - are coming up short.

"There's no other single country with such a high vacancy rate," said Gan, of Chengdu's Southwestern University of Finance and Economics. "Should any crack emerge in the property market, the homes to be offloaded will hit China like a flood."