The strict regulation on hi-tech exports from the US is one of the reasons for the country's trade deficit with China, Wang Chao, assistant minister of commerce, said at the US-China Clean Energy Dialogue. Expanded hi-tech exports from the US will ease the gap, he added.

Yao Wenping, vice-president of the China Chamber of Commerce for Import and Export of Machinery and Electronic Products (CCCME), agreed. "Every year, many Chinese enterprises want to import hi-tech materials and equipment from the US, but encounter obstacles."

The US complains about the huge trade deficit with China - in the first 11 months of 2007, it amounted to $142.22 billion. This has put pressure on China to take various measures, such as appreciating the yuan, to narrow the gap.

China has taken a series of measures, such as reducing and abolishing its export tax rebates for many products, to dampen exports and encourage imports.

Analysts said if the US is more open in its hi-tech export policy, things will improve. The US, instead, alleges that China might have "dual uses" for some hi-tech products and made a new rule in June that expanded licensing requirements for a longer list of items.

Analysts say the US overreacted since many of the products that China wants are simply for civilian purposes.

Clean energy could be a field where the US can make more efforts to ease its export controls to help balance Sino-US trade and promote healthy economic and trade exchanges between the two sides, said CCCME's Yao. "Products in this field are purely for civilian use."

Every year Chinese enterprises import huge amounts of solar-energy materials, equipment and technologies from the US, she said.

China's solar photovoltaic companies have grown fast in recent years. There are 50 to 60 such firms, mostly privately owned, said Yao.

Yao estimated that this year, the value of clean-energy technology procurement and cooperation between Chinese and US firms could amount to $10 billion if "they did not encounter obstacles". It could be even higher.