The growing popularity of English books in China was described as a "surge" by Zhao Wei, publisher at a Beijing- based international publishing house.
Zhao said her publishing house witnessed a double in sales volume in China, declining to reveal the exact number.
According to other publishers based in Beijing and Shanghai, the "surge" has mainly occurred in sales of textbooks, children's books, travel books and novels.
The sharp increase during the week-long book fair reflects the bigger picture of the English book market, Lang was quoted as saying by state-run Xinhua news agency.
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"Chinese people are attracted to the original version of English books, many of which first reached Chinese readers after being translated into Chinese," said Gu Bin, general manger of Shanghai Book Traders company.
English-language teaching materials have increased with the development of international schools, analysts said.
Additionally, some EMBA and MBA courses require original books, Gu told Xinhua.
"Foreign children's books emphasise cultivating children's abilities via games or tasks, or telling truths through vivid stories, and Chinese parents welcome this," Lang said.
Better logistics have also increased sales in remote areas like Xinjiang Uygur Autonomous Region and Tibet Autonomous Region, said Zhao Wei.
"When physical bookstores dominated, English books used to be available only in the biggest cities like Beijing and Shanghai.