Most countries worry about brain drain. China is worried about millionaire drain.

A new report in China shows that 150,000 Chinese – most of them wealthy – emigrated to other countries in 2011. While that number may not seem high for a country of more than a billion people, the flight of China’s richest – and the offshoring of their fortunes – could cost the country jobs and economic growth, according to the study from the Center for China and Globalization and the Beijing Institute of Technology.

‘The private economy contributes more than 60 percent of China’s GDP and it absorbs a majority of employees. So if private business owners emigrate with their capital, it would mean less investment in the domestic market, so fewer jobs would be created,’ Wang Huiyao, director of the Center for China and Globalization, told the state-run China Daily today.

The fleeing millionaires mainly made their money in real estate, foreign currency and deposits and stocks, among other fields, according to the report. They are mainly leaving Beijing, Shanghai and coastal provinces such as Zhejiang, Guangdong and Jiangsu. (Read more: BRICs Outpace U.S. in Millionaires)

The Chinese government has struggled to stem the tide of wealthy Chinese moving abroad […]