China approved about 248 applications in the technological sector annually from 2004 to 2011, a rather low rate for a country eager for expertise, Liu said.

The stringent requirements are part of the reason for the low numbers, Liu said.

"The current method of evaluating a foreigner's contribution to China by the rank of his post is one-sided and also deters overseas expertise from coming," he said.

Other than assessing the rank of applicants, he suggested the government classify foreigners by sectors and list the most required skills needed for potential immigrants.

As for investment immigration, where applicants set up a commercial enterprise, Liu said the draft also proposes reducing the investment criteria.

China's first legislation covering the exit and entry of Chinese citizens and foreigners, the Law on the Exit and Entry Administration, was passed in June and will take effect in July 2013. It allows for an increase in the number of green cards.

Wang Huiyao, deputy director of China Talent Research, an institute affiliated to the Ministry of Human Resources and Social Security, said the government is also planning to broaden the use of green cards.

He said the human resources authority will soon release a document that allows green card holders to enjoy equal rights as Chinese citizens, except for the right to elect and be elected.

He said the document was signed this month and will be introduced possibly as early as December.

Under the new document, green card holders will be able to use the card as a travel certificate, such as checking in at hotels, he said.

"Most importantly, it's expected to eventually build a personal network by associating the user's bank account, insurance account and medical care account with the permit. That makes life easier for foreigners," he said.

Emilie Bourgois, a public relations manager in Beijing, has been studying and working in the country for more than four years.

She said it is sensible to require a minimum of 10 years, since China is among the "hottest destinations" in the world.

Green cards provide foreigners with a sense of security, especially for those married with children.

"Green card applicants usually have devoted a big chunk of their life to China and deserve the convenience of permanent residency," she said.