THERE IS NO FUTURE THERE:

At 30, Chen Kuo had what many Chinese dream of: her own apartment and a well-paying job at a multinational corporation. But in mid-October, Ms. Chen boarded a midnight flight for Australia to begin a new life with no sure prospects.

Like hundreds of thousands of Chinese who leave each year, she was driven by an overriding sense that she could do better outside China. Despite China's tremendous economic successes in recent years, she was lured by Australia's healthier environment, robust social services and the freedom to start a family in a country that guarantees religious freedoms.

"It's very stressful in China -- sometimes I was working 128 hours a week for my auditing company," Ms. Chen said in her Beijing apartment a few hours before leaving. "And it will be easier raising my children as Christians abroad. It is more free in Australia."

As China's Communist Party prepares a momentous leadership change in early November, it is losing skilled professionals like Ms. Chen in record numbers. In 2010, the last year for which complete statistics are available, 508,000 Chinese left for the 34 developed countries that make up the Organization for Economic Cooperation and Development. That is a 45 percent increase over 2000.

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