ERNST & Young is "optimistic" its revenue in China will expand by double digits in the coming years, a top company official said.

"We're very optimistic that the double-digit revenue growth in China's mainland will continue," said Albert Ng, Ernst & Young's China chairman and its managing partner in the mainland, Hong Kong, Macau and Taiwan.

"We have seen over 20 percent year-on-year growth in our revenue in the first half this year and I'm very optimistic of our business in the next fiscal year," Ng added.

But the company, one of the world's top accounting firms, expected flat revenue in fiscal year 2010 before an improvement in the next fiscal year.

"We expect to see our global revenue remain generally flat in fiscal year 2010 and increase in that of 2011," James Turley, chairman and CEO of Ernst & Young, said in Shanghai over the weekend.

The company said it has invested an average of US$100 million in China in the past few years and that trend will continue in the future.