The logo of US software giant Microsoft at a technology exhibition in Beijing. The American Chamber of Commerce in China said some 85 percent of surveyed US companies reported increased revenue from their China operations last year. [Photo / China Daily]

BEIJING - More US businesses in China said they were profitable last year even as they are still worried about the prospects of local market access, the American Chamber of Commerce in China (Amcham) said on Tuesday.

Seventy-eight percent of member companies surveyed by Amcham said their China operations in 2010 were very profitable or profitable, the highest proportion in survey results dating back to 2002, the Beijing-based chamber said in its annual business-climate survey.

At the same time, the country's rapid economic growth makes it an increasingly important market for companies such as General Motors Co and General Electric Co.

Some US companies, however, said the Chinese government is making it increasingly difficult to do business in the world's second-biggest economy.