China's Ministry of Labor and Social Security estimated there were 150,000 expatriates legally employed in the country in 2005. This was almost double the figures from three years ago.

In 2008 this figure is expected to soar to more than 250,000.

To be considered a legal hire, the worker must have a valid "Z" visa and accompanying work permit. There are estimates that the total number of expatriates working in major cities like Shanghai and Beijing could be more than 500,000, with most deciding to instead carry "F" visas, which do not legally permit them to work.

(China Daily December 21, 2007)