Trade frictions dented exports of high-tech products and become a new concern for China and its trading partners last year, a top official said on Thursday.

Shen Danyang, a spokesman for the Ministry of Commerce, said that after China became the world's largest goods trader in 2013, many countries started to curb the import of Chinese products to narrow trade deficits

"We noticed that China's photovoltaic products, wind turbines and smartphones have encountered more trade investigations in 2014," said Shen. "The United States, Canada and Australia have all launched anti-dumping and countervailing duty investigations on Chinese photovoltaic products, an emerging change in China's foreign trade last year."